21
WordNet
adjective
(1) Being one more than twenty
noun
(2) The cardinal number that is the sum of twenty and one
WiktionaryText
Number
twenty-one
- The cardinal number occurring after twenty and before twenty-two, represented in Roman numerals as XXI and in Arabic numerals as 21. Ordinal: twenty-first.
- Arabic numerals: 21
- Roman numerals: XXI
- Greek numerals: κα΄