See the related link for a complete explanation of long and short scale countries and the history of the naming convention for large numbers.
The long and short scales are two of several different large number naming systems used throughout the world: Short scale is the English translation of the French term échelle courte.[1] It refers to a system of large number names in which every new term greater than million is 1,000 times the previous term: billion means a thousand millions (109), trillion means a thousand billions (1012), and so on. Long scale is the English translation of the French term échelle longue. It refers to a system of names in which every new term greater than million is 1,000,000 times the previous term: billion (from bi and million) means a million to the power of two or a million millions(1012), trillion (from tri and million) means a million to the power of three or a million billions(1018), and so on. Your question is actually factually incorrect as the UK (since 1974) now uses the short scale numbering system as does the US. However, there might be some legacy use of the long scale usage.
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
Trillion
Trillion.
chuck norris
12.
As a number there are 12
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