The Roman numeral MCCXXI corresponds to the Arabic number 1221.
MCCXXI = 1221
Symbols are written and read from left to right, from highest to lowest.
If number MCCXXI is within to text or sentence it should be read in its equivalent in Arabic numbers, in this case 1221.
MCCXX is number 1220
MCCXXII is number 1222
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