The Roman numeral MCDXXI corresponds to the Arabic number 1421.
MCDXXI = 1421
Symbols are written and read from left to right, from highest to lowest.
If number MCDXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1421.
MCDXX is number 1420
MCDXXII is number 1422
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