sextillion
Sex*til"lion, n. Etym: [Formed (in imitation of million) fr. L. sextus sixth, sex six: cf. F. sextilion.] Defn: According to the method of numeration (which is followed also in the United States), the number expressed by a unit with twenty-one ciphers annexed. According to the English method, a million raised to the sixth power, or the number expressed by a unit with thirty-six ciphers annexed. See Numeration.