How many trillions make a zillion?
The word zillion is a fictitious amount, and is used to express an unspecified but extraordinarily large number.
You cannot know the amount of zero's in a zillion because a zillion is an undetermined number. People only use it to describe large numbers... just like infinity. You can get more information if you type in the question "How many zeros dooes a zillion have?" It's probably the same as your question, but it has more information than I am able to provide. Hope this helps.