XXI-IIII-MDCCCCLXXXIIII (1984) or XXI-IV-IVXMM (2000-16). Note that 1984 in Roman numerals is not MCMLXXXIV as you might have been told or read.
Chat with our AI personalities
The Roman numeral for 21 is XXI
The Roman numeral for 21 is XXI
XXL is not a valid roman numeral.
The Roman numeral for December 21, 2009 is XXI.XII.MMIX.
21 = XXI