The number 6721 is written in Roman numerals like this: VIDCCXXI
VIDCCXXI = 6721
Above 3,999, a line over a numeral multiplies its value by 1,000.
6721 is written with VI under a line (6 × 1,000 = 6,000), followed by DCCXXI (721).
6720 in Roman numerals: VIDCCXX
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