XXI is the Roman numeral for 21.
The Roman numeral of XXI is equivalent to 21
21 4
If you mean MMXXI then it is the equivalent of 2021
XXI = 21
if you mean XXI -- that is equal to 21
X is 10, two X's would be 20, I is 1 and since it comes after the XX, XXI would be 21.
XXI = 21
XXI is the same thing as 21.
Freak XXI was created in 1998.
Hespèrion XXI was created in 1974.
Converxencia XXI was created in 2009.