September is the ninth month. 9 is IX. 21 is XXI. It would be written as IX-XXI
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September would be shown as the number 9 for the ninth month. It would be written as IX-XXI.
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.
XXI