File:Squaring_the_Square_(minimum).png · Wikimedia Commons · See Wikimedia Commons
Also known as the number 21, 1*21, 21*1, twenty-one, twenty one, ㉑
natural number
AI overview
21 is a whole number that comes after 20 and before 22 in the sequence of counting numbers. It is the product of multiplying 3 by 7, making it a composite number with practical applications in mathematics and everyday contexts like telling time and measuring.
AI-generated from the Wikipedia summary — may contain errors.
Wikidata facts
- Image
- Zlin skyscraper 01.jpg
Show 7 more facts
- code
- 30
- Unicode character
- ㉑
- number of decimal digits
- 2
- Commons category
- 21 (number)
- numeric value
- 21
- P8168
- dual wield
- name in hiero markup
- V20-V20-Z1
via Wikidata · CC0
~6 min read
Article
← 20 21 22 23 24 25 26 27 28 29 → List of numbers Integers
← 0 10 20 30 40 50 60 70 80 90 →
Gallery (3)
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Connections
natural number
Entity
semiprime
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Gregorian calendar
Entity
21st century
Entity
International Standard Book Number
Entity
prime number
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square
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integer
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infinity
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gambling
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Q36977
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11
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Q37141
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1000000
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20
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15
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Q38582
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Q43016
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Roman numerals
Entity
18
Entity