21 Jenụwarị bu ubochi nke 21st (nke iri abụọ na out) na onwa ana kpo Jenụwarị. Na Gregorian calender, 21 Jenụwarị bu ubochi nke 21st na afo. Anyi nwere agugu ubochi 344 (345 na afo nke ana-kpo leap-year) du mgbe afo na agwu.