21 Eprel bu ubochi nke 21st (nke iri abụọ na out) na onwa ana kpo Eprel. Na Gregorian calender, 21 Eprel bu ubochi nke 111th (112th na afo nke ana-kpo leap year) na afo. Anyi nwere agugu ubochi 254 du mgbe afo na agwu.
