What is 21 with 15 zeros?

Learn how to shorten, say, and write 21 with 15 zeros!

In Numbers
21 with 15 zeros written out with all the zeros looks like this:

21 000 000 000 000 000

10 to the Power Of
This is how to write 21 with 15 zeros to ten to the power of:

21 x 10¹⁵

Scientific e Notation
You can also shorten 21 with 15 zeros down further to Scientific e Notation as follows:

2.1e16

Verbally
However, what most want to know, is how to read and say it correctly. The number 21 with 15 zeros is:

Twenty-One Quadrillion

Big Numbers
Enter another number and how many zeros it has here:

What is 21 with 16 zeros?
Check out the next big number on our list that we tackled.