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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.
XXI is the number 21 in Roman numerals.
x = 10 i = 1 xxi = 21
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May 21, 1995 in roman numerals is written as XXI V MCMLXXXV.