If you mean a number followed by 12 zeros then it is a trillion: e.g. 1,000,000,000,000
A trillion.
There are 15 zeros in the number 6,000,000,000,000,000 (6 trillion). ---- Actually, this is six trillion -> 6,000,000,000,000 so there are actually 12 zeros in 6 trillion.
12 zeros in a trillion.
1,000,000,000,000 is 1 trillion a 1 followed by 12 zeros a 1 followed by 15 zeros is 1 quardrillion
As a number there are 12
Trillion.
12.
Trillion
It has 21 zeros, because 'Giga' means 'a Billion'. Thus, one GigaTrillion is 1 Billion-Trillion. A billion has 9 zeros, and a trillion has 12 zeros. However, if you are referring to the United Kingdom, a billion has 12 zeros and a trillion has 18 zeros, so it would be 30 zeros.
1 trillion =1,000,000,000,000 12 zeros
if you mean a number followed by 12 zeros like this: 1000000000000 then that is 1 trillion