XXI x C
Else clues• 2,100, in Roman numerals
• 2,100, to Caesar
• 2100
• 2100, in the credits
• 250th anniversary of the incorporation of Los Angeles
• CCX x X
• III x DCC
• LXXV x XXVIII
• LXXXIV
• MMCCCX minus CCX
• Nero's 2100
• Roman's 2,100
• The end of this century
• XXXV x LX