n. 千的七乘方,百万的六乘方

[ noun ]
the number that is represented as a one followed by 21 zeros
<noun.quantity>

Sextillion \Sex*til"lion\, n. [Formed (in imitation of million)
fr. L. sextus sixth, sex six: cf. F. sextilion.]
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}.