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A Sextillion (1 Sextillion) is 10 to the power of 21 (10^21). This is a very big number!

How many zeros in a Sextillion?

There are 21 zeros in a Sextillion.

What's before Sextillion?

A Quintillion is smaller than a Sextillion.

What's after Sextillion?

A Septillion is larger than a Sextillion.


A Sextillionaire is someone whos assets, net worth or wealth is 1 or more Sextillion. It is unlikely anyone will ever be a true Sextillionaire. If you want to be a Sextillionaire, play Tap Tales!

Is Sextillion the largest number?

Sextillion is not the largest number. Infinity best describes the largest possible number - if there even is one! We cannot comprehend what the largest number actually is.

Sextillion written out

Sextillion is written out as:


Big Numbers

This is just one of many really big numbers!

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