M = 1000 and CM = 900, so MCM = 1900. L = 50 and X = 10, so LXXX = 80. V = 5 and I = 1 so VII = 7. So, the numerals would represent 1987.
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MCMLXXXVII
mcmlxxxvii
MCMLXXXVII
The date of birth 21051987 in Roman numerals is XXI V MCMLXXXVII.
To write 19-11-1987 in Roman numerals, you would write it as XIX-XI-MCMLXXXVII.