21 (number)

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← 20 21 22 →
Cardinaltwenty-one
Ordinal21st
(twenty-first)
Factorization3 × 7
Greek numeralΚΑ´
Roman numeralXXI
Binary101012
Ternary2103
Quaternary1114
Quinary415
Senary336
Octal258
Duodecimal1912
Hexadecimal1516
Vigesimal1120
Base 36L36

The number 21 may refer to:

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