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.
x = 10 i = 1 xxi = 21
21
XXI is the number 21 in Roman numerals.
XXI
I/XXI/LXXXIX
21
ix is 9, and xxi is 21 In Roman Numerals it is IX for 9 and XXI for 21. You see the letters in Roman Numerals have always been upper case (Capitals) for some reason.
May 21, 1995 in roman numerals is written as XXI V MCMLXXXV.
December 21, 2011 is written as "XII XXI MMXI" in Roman numerals.
V-xxi-ixi-vii viImproved Answer:-In today's notation of Roman numerals it is: V-XXI-MCMLXXVI
September 21, 2013 can be written in Roman numerals as "XXI-IX-MMXIII".