Billion: 9
Trillion: 12
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There are nine zeros in a billion (1,000,000,000) and twelve zeros in a trillion (1,000,000,000,000).
21 zeroes: 1,000,000,000,000,000,000,000
A trillion is followed by 12 zeros, and a billion is followed by 9 Zeros, so it is 5x21^10=5,000,000,000,000,000,000,000
In the UK there are million = 6 zeros trillion = 9 zeros billion = 12 zeros and 2 zeros in 9 hundred so 12 + 2 = 14
The prefix bi- means 2. Similarly, the prefix tri- means 3. Originally, the billion was defined as a one followed by 12 zeros - twice as many as the million; while the trillion had three times as many zeros than the million. Somehow, the meaning changed over time, especially in English-speaking countries (to a one with 9 zeros for a billion, and a one with 12 zeros for a trillion).
7. 32,407,119,000,000 The answer above is using the American trillion and billion. The European version of this number is 32,000,407,000,119,000,000, and therefore has 13 zeros.