The number 7421 is written in Roman numerals like this: VIICDXXI
VIICDXXI = 7421
Above 3,999, a line over a numeral multiplies its value by 1,000.
7421 is written with VII under a line (7 × 1,000 = 7,000), followed by CDXXI (421).
7420 in Roman numerals: VIICDXX
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