what is after a quintillion
IncaBlue. Confidence votes 50.4K. Good with numbers and even better with a calculator. The next big number after quintillion is sextillion, (that's 1 followed by 21 zeros!) Depends what you mean, the next consecutive number is a quintillion and 1, just like the number after 100 is 101.00 *EDIT* to the idiot who said 100, you would have 100 billion. to put it in ways to understand, if you had 999 billion, just add one more billion and you have quadrillion, â¦ and you would need 1 quadrillion past 999 quadrillion to reach quintillion. so... many many many billions.