21
Natural number
Also known as the number 21 · 1*21 · 21*1 · twenty-one · twenty one · ㉑
- Instance of
Overview
All data
62 statements · 2% with external sources · numbers in brackets are citations
- Code
- ௨௰௧ encoding: Tamil number notation using ௰, ௱, ௲
- ௨௧ encoding: Tamil number notation using ASCII 0
- XXI encoding: Roman numeral in basic notation
- 𒎙𒐕 encoding: Babylonian numerals
- 10101 encoding: binary numeral system
- 25 encoding: octal
- 19 encoding: duodecimal
- 15 encoding: hexadecimal
Show 19 moreShow less
- 210 encoding: ternary numeral system
- 111 encoding: quaternary numeral system
- 41 encoding: quinary
- 33 encoding: senary
- 30 encoding: septenary
- 23 encoding: nonary
- 21 encoding: decimal
- 1A encoding: undecimal
- 18 encoding: base 13
- 17 encoding: tetradecimal
- 16 encoding: pentadecimal
- 14 encoding: heptadecimal
- 13 encoding: octodecimal
- 12 encoding: enneadecimal
- 11 encoding: vigesimal
- 10 encoding: unvigesimal
- ΚΑʹ encoding: Greek alphabetic numerals
- ൨൧ encoding: Malayalam number notation using ASCII 0
- ൨൰൧ encoding: Malayalam number notation using ൰, ൱, ൲
- Name in hiero markup
- V20-V20-Z1 encoding: Egyptian numeral in hieroglyphic notation
On other databases
10 identifiers linking 21 across the web's reference databases