The Roman numeral MCMXXI corresponds to the Arabic number 1921.
MCMXXI = 1921
Symbols are written and read from left to right, from highest to lowest.
If number MCMXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1921.
MCMXX is number 1920
MCMXXII is number 1922
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