The Roman numeral MMCDXXI corresponds to the Arabic number 2421.
MMCDXXI = 2421
Symbols are written and read from left to right, from highest to lowest.
If number MMCDXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2421.
MMCDXX is number 2420
MMCDXXII is number 2422
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