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.
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
The Roman numeral for 21 is XXI
The Roman numeral for 21 is XXI
21 = XXI
XXL is not a valid roman numeral.
The Roman numeral for December 21, 2009 is XXI.XII.MMIX.
21 = XXI
XXI
21 can be written as XXI in Roman numerals.
21
XXI = 21
XXI
21 in Roman numerals is XXI (10 + 10 + 1)