The Roman numeral MMCXXI corresponds to the Arabic number 2121.
MMCXXI = 2121
Symbols are written and read from left to right, from highest to lowest.
If number MMCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2121.
MMCXX is number 2120
MMCXXII is number 2122
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