xxi, xxii, xxiii, xxiv, xxv
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XXI is the number 21 in Roman numerals.
21 in Roman numerals is XXI. 1 in Roman numerals is I. 90 in Roman numerals is XC. So, 21 1 90 would be XXI I XC in Roman numerals.
25 in Roman numerals is XXV
The Roman numerals "XXV" stand for the number 25.
It is 25 - 4 so it equals 21 which is XXI