What 3 numbers come after trillion?

Answer 1

The next larger numbers on the short scale (eg in US, based on powers of a thousand plus one) where 1 trillion = (10^3)^(3+1) = 10^12 are:

quadrillion = 1 thousand trillion = 10^15

quintillion = 1 million trillion = 10^18

sextillion = 1 billion trillion = 10^21

For the long scale (eg in Europe, based on powers of a million) where 1 trillion = (10^6)^3 = 10^18:

trilliard = 1 thousand trillion = 10^21

quadrillion = 1 million trillion = 10^24

quadrilliard = 1 thousand quadrillion 10^27