The Roman numeral MMMCCXXI corresponds to the Arabic number 3221.
MMMCCXXI = 3221
Symbols are written and read from left to right, from highest to lowest.
If number MMMCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 3221.
MMMCCXX is number 3220
MMMCCXXII is number 3222
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