The Roman numeral MMCMXXI corresponds to the Arabic number 2921.
MMCMXXI = 2921
Symbols are written and read from left to right, from highest to lowest.
If number MMCMXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2921.
MMCMXX is number 2920
MMCMXXII is number 2922
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