Il numero 1621, milleseicentoventuno in Italiano, in Francese si dice mille six cent vingt-et-un.
Il numero ordinale 1621° in francese si dice mille six cent vingt-et-unième.
1612: mille six cent douze
1613: mille six cent treize
1614: mille six cent quatorze
1615: mille six cent quinze
1616: mille six cent seize
1617: mille six cent dix-sept
1618: mille six cent dix-huit
1619: mille six cent dix-neuf
1620: mille six cent vingt
1622: mille six cent vingt-deux
1623: mille six cent vingt-trois
1624: mille six cent vingt-quatre
1625: mille six cent vingt-cinq
1626: mille six cent vingt-six
1627: mille six cent vingt-sept
1628: mille six cent vingt-huit
1629: mille six cent vingt-neuf
1630: mille six cent trente