The Roman numeral MDCXXI corresponds to the Arabic number 1621.
MDCXXI = 1621
Symbols are written and read from left to right, from highest to lowest.
If number MDCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1621.
MDCXX is number 1620
MDCXXII is number 1622
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