33
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A septillion has 24 zeros. A decillion has 33 zeros. A septendecillion has 54 zeros. I can't find your term in any of my reference works, so I guess it can have as many (or as few) zeros as you want.
33
33: 1,000,000,000,000,000,000,000,000,000,000,000
33
1 decillion multiplied by 1 thousand= 1 undecillion 1 decillion multiplied by 1 million= 1 duodecillion Many more are listed in the Wikipedia article "Names of Large Numbers."