The Roman numeral MDCCCXXI corresponds to the Arabic number 1821.
MDCCCXXI = 1821
Symbols are written and read from left to right, from highest to lowest.
If number MDCCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1821.
MDCCCXX is number 1820
MDCCCXXII is number 1822
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