The Roman numeral MMCCCXXI corresponds to the Arabic number 2321.
MMCCCXXI = 2321
Symbols are written and read from left to right, from highest to lowest.
If number MMCCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 2321.
MMCCCXX is number 2320
MMCCCXXII is number 2322
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