SEXTILLION
sextillion
(noun) the number that is represented as a one followed by 21 zeros
Source: WordNet® 3.1
Etymology
Numeral
sextillion
(US; modern British & Australian, short scale) A trillion billion: 1 followed by 21 zeros, 1021.
(dated British & Australian, long scale) A million quintillion: 1 followed by 36 zeros, 1036.
Synonyms
• (1021): a long scale trilliard
• (1036): a short scale undecillion
Source: Wiktionary
Sex*til"lion, n. Etym: [Formed (in imitation of million) fr. L.
sextus sixth, sex six: cf. F. sextilion.]
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition