21 in Roman numerals

The number 21 (twenty-one) is written in Roman numerals as follows: XXI

21
XXI

XXI = 21
The Roman numbering system (Roman numerals) was created in Ancient Rome, and was used throughout the Roman Empire. It consists of seven capital letters of the Latin alphabet: I, V, X, L, C, D and M.
Keywords: How is the number 21 in Romano, How to write 21 in Roman numerals