The Roman numeral MMDCCCXXI corresponds to the Arabic number 2821.
MMDCCCXXI = 2821
Symbols are written and read from left to right, from highest to lowest.
If number MMDCCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2821.
MMDCCCXX is number 2820
MMDCCCXXII is number 2822
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