* Usually it means a thousand thousand billion. That is to say, a 1 followed by fifteen zeros.
* (Dated usage, notably British) A million trillion or a 1 followed by 21 zeros. http://freefactfinder.com/definition/Quadrilion.html
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Centillion is a 1 with 303 zeros so this is the biggest.
one hundred quadrilion
Seven zeros.
there are 21 zeros
9 zeros