The Roman numeral MDCCXXI corresponds to the Arabic number 1721.
MDCCXXI = 1721
Symbols are written and read from left to right, from highest to lowest.
If number MDCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1721.
MDCCXX is number 1720
MDCCXXII is number 1722
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