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Hundred quintillion one.
It's over 999 docilion, 999 nonillion, 999 octilion, 999 septillion, 999 sextillion, 999 quintillion, 999 quadrilion, 999 trillion, 999 billion, 999 million, 999 thousand, 999. And that's the biggest number I know.
quintillion
A sextillion which has a total of 21 zeros.
Quintillion