21 Disemba bu ubochi nke 21st (nke iri abụọ na out) na onwa ana kpo Disemba. Na Gregorian calender, 21 Disemba bu ubochi nke 355th (356th na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 10 du mgbe afo na agwu. Édémédé nke dị ntakiri. Nye Wikipedia áká Í me kọ sáasa.