The Roman numeral MMDCCXXI corresponds to the Arabic number 2721.
MMDCCXXI = 2721
Symbols are written and read from left to right, from highest to lowest.
If number MMDCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2721.
MMDCCXX is number 2720
MMDCCXXII is number 2722
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