That's a tredecillion!
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1 followed by 18 zeros is a quintillion.
That depends how many zeros follow the 1.
Unquadragintillion is a large number represented as 10 raised to the power of 42. Therefore, it has 42 zeros following the digit 1. In numerical form, it is written as 1 followed by 42 zeros: 1,000,000,000,000,000,000,000,000,000,000,000,000,000,000.
1 decillion
If you meant a number followed by 100 zeros, that would be Google if the number was a 1. If you meant 100 zeros followed by a number, that would be just that number.