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A Undecillion (1 Undecillion) is 10 to the power of 36 (10^36). This is an extremely large number!

How many zeros in a Undecillion?

There are 36 zeros in a Undecillion.

What's before Undecillion?

A Decillion is smaller than a Undecillion.

What's after Undecillion?

A Duodecillion is larger than a Undecillion.


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

Is Undecillion the largest number?

Undecillion 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.

Undecillion written out

Undecillion is written out as:


Big Numbers

This is just one of many really big numbers!

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