Number 21 facts
The odd number 21 is spelled 🔊, and written in words: twenty-one. The ordinal number 21st is said 🔊 and written as: twenty-first. The meaning of the number 21 in Maths: Is it Prime? Factorization and prime factors tree. The square root and cube root of 21. What is 21 in computer science, numerology, codes and images, photo art, writing and naming in other languages. Other interesting facts, videos, news related to 21. ‹‹ 20 22 ››
Interesting facts about the number 21
More photos ...Asteroids
- (21) Lutetia is asteroid number 21. It was discovered by H. M. S. Goldschmidt from Paris on 11/15/1852.
Aircrafts and flights
- 07/08/1965 the Canadian Pacific Air Lines plane, flight number 21, Douglas DC-6B crashed in near 100 Mile House, BC, Canada 46 passengers and 6 crew members died.
Areas, mountains and surfaces
- The total area of Hokkaido is 30,394 square miles (78,719 square km). Country Japan (Hokkaido region). 21th largest island in the world.
- The total area of Nauru is 8.1 square miles (21 km²)
Astrology
- It is one of the lucky numbers for the zodiac sign Aries and Scorpio.
- What is astrology and what is it for?
Distances
- There is a 14 miles (21 km) direct distance between Bogor (Indonesia) and Depok (Indonesia).
- There is a 14 miles (21 km) direct distance between Dombivli (India) and Navi Mumbai (India).
- There is a 14 miles (21 km) direct distance between Ecatepec (Mexico) and Mexico City (Mexico).
Games
- Pokémon Spearow (Onisuzume) is a Pokémon number # 021 of the National Pokédex. Spearow is a normal, flying type Pokémon in the first generation. It is a Flying Egg group Pokémon. Spearow's other indexes are Kalos Centro index 109 - Highland Pokédex, Johto index 013 .
- 21 is a player's highest score in a hand of Blackjack or Twenty-one.
History and politics
- United Nations Security Council Resolution number 21, adopted 2 April 1947. Trusteeship of strategic areas: German Pacific Islands. Resolution text.
In other fields
- Dreaming of the number 21 means transmuting all of the above for spiritual balance, if this number repeats itself in time it is a good sign that you are achieving it.
Mathematics
- 21 is the number of spots on a standard cubical die (1+2+3+4+5+6)
- 21 is the first century with ten prime years
- 21 is the smallest number of distinct squares needed to tile a square.
Music
- '21 Seconds' is a song from the acronym of the British garage So Solid Crew.
- '21 Questions ', in Spanish '21 questions', is a song performed by 50 Cent, an American rapper and businessman.
- '21' is the debut single from The Paddingtons. '21' is also a song recorded by American singer Hunter Hayes.
- '21 Guns ', in Spanish '21 armas de fuego', is a song by the American punk rock band Green Day.
- '21 (Moon Water) 'is a song by the North American indie band Bon Iver.
- '21 Summer ', in Spanish '21 Verano', is a song by the American country music duo Brothers Osborne.
- More music ...
- '21 Savage 'is an American rapper, singer and songwriter. His name is Shyjah Joseph (Decatur, Georgia, October 22, 1992).
Science
- Scandium is the chemical element in the periodic table that has the symbol Sc and atomic number 21.
Sports
- The best athletes to wear number 21
Roberto Clemente, MLB; Tim Duncan, NBA; Warren Spahn, MLB; LaDainian Tomlinson, NFL; Sammy Sosa, MLB; David Pearson, NASCAR; Roger Clemens, MLB; Deion Sanders, NFL
Tv, movies and cinematography
- 21 trailer
- Movie: 21 Days Together Year: 1940 Runtime: 72 Director: Basil Dean With: Vivien Leigh; Leslie banks
- Film: 21 Grams (21 Grams) Year: 2003 Duration: 125 Director: Alejandro González Inárritu With: Sean Penn; Benicio, the bull
- Film: '21 blackjack '(English title: 21) is a 2008 film directed by Robert Luketic and starring Jim Sturgess, Kevin Spacey, Kate Bosworth and Laurence Fishburne.
Please write us
If you know something interesting about the number 21 or any natural number (positive integer), please write to us.What is 21 in other units
The decimal (Arabic) number 21 converted to a Roman number is XXI.
Roman and decimal number conversions.
21 kilograms (kg) = 46.3 pounds (lbs)
21 pounds (lbs) = 9.5 kilograms (kg)
21 kilometers (km) equals to 13.049 miles (mi).
21 miles (mi) equals to 33.796 kilometers (km).
21 meters (m) equals to 33.796 feet (ft).
21 feet (ft) equals 6.401 meters (m).
21 centimeters (cm) equals to 8.3 inches (in).
21 inches (in) equals to 53.3 centimeters (cm).
21° Fahrenheit (°F) equals to -6.1° Celsius (°C)
21° Celsius (°C) equals to 69.8° Fahrenheit (°F)
21 Horsepower (hp) equals to 15.44 kilowatts (kW)
21 kilowatts (kW) equals to 28.56 horsepower (hp)
| The number 21 converted to a Mayan number is |
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| Decimal and Mayan number conversions. |
Weight conversion
21 kilograms (kg) = 46.3 pounds (lbs)
21 pounds (lbs) = 9.5 kilograms (kg)
Length conversion
21 kilometers (km) equals to 13.049 miles (mi).
21 miles (mi) equals to 33.796 kilometers (km).
21 meters (m) equals to 33.796 feet (ft).
21 feet (ft) equals 6.401 meters (m).
21 centimeters (cm) equals to 8.3 inches (in).
21 inches (in) equals to 53.3 centimeters (cm).
Temperature conversion
21° Fahrenheit (°F) equals to -6.1° Celsius (°C)
21° Celsius (°C) equals to 69.8° Fahrenheit (°F)
Power conversion
21 Horsepower (hp) equals to 15.44 kilowatts (kW)
21 kilowatts (kW) equals to 28.56 horsepower (hp)
Codes and images of the number 21
Number 21 morse code: ..--- .----Sign language for number 21:
Number 21 in braille:
| Images of the number | |
| Image (1) of the number | Image (2) of the number |
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| More images, other sizes, codes and colors ... | |
Number 21 infographic
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Year 21 AD
Publius Sulpicius Quirinius, Roman governor of Syria, died.
Gregorian, Hebrew, Islamic, Persian and Buddhist Year (Calendar)
Gregorian year 21 is Buddhist year 564.Buddhist year 21 is Gregorian year 522 a. C.
Gregorian year 21 is Islamic year -620 or -618.
Islamic year 21 is Gregorian year 641 or 642.
Gregorian year 21 is Persian year -602 or -601.
Persian year 21 is Gregorian 642 or 643.
Gregorian year 21 is Hebrew year 3781 or 3782.
Hebrew year 21 is Gregorian year 3739 a. C.
The Buddhist calendar is used in Sri Lanka, Cambodia, Laos, Thailand, and Burma. The Persian calendar is the official calendar in Iran and Afghanistan.
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Advanced math operations
Is Prime?
The number 21 is not a prime number. The closest prime numbers are 19, 23.
The 21st prime number in order is 73.
Factorization and factors (dividers)
The prime factors of 21 are 3 * 7
The factors of 21 are 1, 3, 7, 21.
Total factors 4.
Sum of factors 32 (11).
Prime factor tree
Powers
The second power of 212 is 441.
The third power of 213 is 9.261.
Roots
The square root √21 is 4,582576.
The cube root of 3√21 is 2,758924.
Logarithms
The natural logarithm of No. ln 21 = loge 21 = 3,044522.
The logarithm to base 10 of No. log10 21 = 1,322219.
The Napierian logarithm of No. log1/e 21 = -3,044522.
Trigonometric functions
The cosine of 21 is -0,547729.The sine of 21 is 0,836656.
The tangent of 21 is -1,527499.
Number 21 in Computer Science
| Code type | Code value |
|---|---|
| Port 21/TCP | FTP Protocol (control) - port for FTP commands and flow control |
| Unix time | Unix time 21 is equal to Thursday Jan. 1, 1970, 12:21 a.m. GMT |
| IPv4, IPv6 | Number 21 internet address in dotted format v4 0.0.0.21, v6 ::15 |
| 21 Decimal | = 10101 Binary |
| 21 Decimal | = 210 Ternary |
| 21 Decimal | = 25 Octal |
| 21 Decimal | = 15 Hexadecimal (0x15 hex) |
| 21 BASE64 | MjE= |
| 21 MD5 | 3c59dc048e8850243be8079a5c74d079 |
| 21 SHA1 | 472b07b9fcf2c2451e8781e944bf5f77cd8457c8 |
| 21 SHA224 | 112a6cfa3ed398a5248c479ed6a061d397633a3fb4d5b9ecca274695 |
| 21 SHA256 | 6f4b6612125fb3a0daecd2799dfd6c9c299424fd920f9b308110a2c1fbd8f443 |
| 21 SHA384 | 395809b7b4da42f70785d72cc237e64c7916fa6b2167c15202c09915071639718369426689502bd6a7b60e24cd90d8e8 |
| More SHA codes related to the number 21 ... | |
If you know something interesting about the 21 number that you did not find on this page, do not hesitate to write us here.
Numerology 21
The meaning of the number 2 (two), numerology 2
Character frequency 2: 1
The number two (2) needs above all to feel and to be. It represents the couple, duality, family, private and social life. He/she really enjoys home life and family gatherings. The number 2 denotes a sociable, hospitable, friendly, caring and affectionate person. It is the sign of empathy, cooperation, adaptability, consideration for others, super-sensitivity towards the needs of others.
The number 2 (two) is also the symbol of balance, togetherness and receptivity. He/she is a good partner, colleague or companion; he/she also plays a wonderful role as a referee or mediator. Number 2 person is modest, sincere, spiritually influenced and a good diplomat. It represents intuition and vulnerability.
More about
the the number 2 (two), numerology 2
...
The number 2 (two) is also the symbol of balance, togetherness and receptivity. He/she is a good partner, colleague or companion; he/she also plays a wonderful role as a referee or mediator. Number 2 person is modest, sincere, spiritually influenced and a good diplomat. It represents intuition and vulnerability.
The meaning of the number 1 (one), numerology 1
Character frequency 1: 1
Number one (1) came to develop or balance creativity, independence, originality, self-reliance and confidence in the world. It reflects power, creative strength, quick mind, drive and ambition. It is the sign of individualistic and aggressive nature.
More about
the the number 1 (one), numerology 1
...
№ 21 in other languages
How to say or write the number twenty-one in Spanish, German, French and other languages.
| Spanish: | 🔊 (número 21) | veintiuno |
| German: | 🔊 (Nummer 21) | einundzwanzig |
| French: | 🔊 (nombre 21) | vingt et un |
| Portuguese: | 🔊 (número 21) | vinte e um |
| Hindi: | 🔊 (संख्या 21) | इक्कीस |
| Chinese: | 🔊 (数 21) | 二十一 |
| Arabian: | 🔊 (عدد 21) | واحد و عشرون |
| Czech: | 🔊 (číslo 21) | dvacet jedna |
| Korean: | 🔊 (번호 21) | 이십일 |
| Danish: | 🔊 (nummer 21) | enogtyve |
| Hebrew: | (מספר 21) | עשרים ואחת |
| Dutch: | 🔊 (nummer 21) | eenentwintig |
| Japanese: | 🔊 (数 21) | 二十一 |
| Indonesian: | 🔊 (jumlah 21) | dua puluh satu |
| Italian: | 🔊 (numero 21) | ventuno |
| Norwegian: | 🔊 (nummer 21) | tjue-en |
| Polish: | 🔊 (liczba 21) | dwadzieścia jeden |
| Russian: | 🔊 (номер 21) | двадцать один |
| Turkish: | 🔊 (numara 21) | yirmibir |
| Thai: | 🔊 (จำนวน 21) | ยี่สิบเอ็ด |
| Ukrainian: | 🔊 (номер 21) | двадцять один |
| Vietnamese: | 🔊 (con số 21) | hai mươi mốt |
| Other languages ... | ||
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Frequently asked questions about the number 21
How do you write the number 21 in words?
21 can be written as "twenty-one".
Number 21 in News
| NyTimes: Iran Releases Narges Mohammadi, Nobel Laureate, From Prison for 21 Days
The activist, whose health has deteriorated, had bone surgery last month. She was just 19 when Iran’s morality police detained her. Dec. 4, 2024 |
| BBC: US bombing suspect 'found in Wales' 21 years on
Daniel Andreas San Diego is in custody after an operation backed by counter terror police. Nov. 26, 2024 |
| France24: 'The Kamal Adwan Hospital has been under a siege for 21 days'
In the northern part of the Gaza Strip, the Kamal Adwan Hospital has been under a siege for 21 days."The director of the hospital has been communicating over social media, saying that they are lacking medication, they are lacking fuel, and today, probably the worst has happened because there is … Oct. 25, 2024 |
| NyTimes: Russia Raises Interest Rate to 21 Percent, Its Highest in Decades
Military spending and recruitment are causing the country’s economy to overheat, leaving regulators in a struggle to rein in rising prices. Oct. 25, 2024 |
| France24: 🔴 Live: Israeli strike on Gaza mosque kills 21, massive blasts rock Beirut
An Israeli strike on a mosque sheltering displaced people in Deir al-Balah in central Gaza early Sunday killed at least 21 people, according to the Gaza civil defence agency. In Lebanon, massive explosions shook the southern suburbs of Beirut overnight as Israel stepped up its bombardments of Hezbollah stronghold areas. … Oct. 6, 2024 |