What series of numbers come after trillion?

Answer 1

Quadrillion which is followed by quintillion, sextillion, septillion, octillion, nonillion and decillion. How many zeros come after each of these numbers varies. In the United States and scientific communities, every addition of three zeros brings about a new series, i.e. a thousand of any set makes it change to the next set of numbers. A thousand million equals a billion, a thousand billion equals a trillion. Other countries change at 6 extra zeros, allowing a thousands count of each set of numbers, so a million millions is a billion, a million billions is a trillion etc.