Template:Infobox nummer

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← 20 21 22 →
Cardinal twinty-ane
Ordinal 21st
(twinty-first)
Factorisation 3 × 7
Greek numeral ΚΑ´
Roman numeral XXI
Binar 101012
Ternary 2103
Quaternary 1114
Quinary 415
Senary 336
Octal 258
Duodecimal 1912
Hexadecimal 1516
Vigesimal 1120
Base 36 L36
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