What is a zillion?

Answer 1

The word zillion is a fictitious amount, and is used to express an unspecified but extraordinarily large number.

The word reflects the English number names of the -illionform, and the Z is added to make it look like one of those really large numbers.

A zillion is a very large indefinite number.

Answer 2

It is no specific number per say. It just means a large number. The general formula is 10^(3n+3) for each n-zillion. So 2 Zllion would be 10^(3*2+3) =10^9 which is a billion. 1 zillion would be 10^6 which is a million.