Sextillion vs. Quintillion — What's the Difference?

The cardinal number equal to 1021.

The cardinal number equal to 1018.

Chiefly British The cardinal number equal to 1036.

Chiefly British The cardinal number equal to 1030.

A trillion billion: 1 followed by 21 zeros, 10²¹.

A billion billion: 1 followed by eighteen zeros, 10¹⁸.

A million quintillion: 1 followed by 36 zeros, 10³⁶.

A million quadrillion: 1 followed by 30 zeros, 10³⁰.

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.

Any very large number, exceeding normal description.

The number that is represented as a one followed by 18 zeros