A trillion has 12 zeros. It is written as 1,000,000,000,000.
To break this down further, a million has 6 zeros (1,000,000), and when you move from million to billion, you add another 3 zeros, bringing the total to 9 zeros (1,000,000,000). Continuing this pattern, when you move from billion to trillion, you add yet another 3 zeros, resulting in a total of 12 zeros.
In summary, a trillion is equal to 1 followed by 12 zeros, making it a very large number used primarily in economics and large-scale calculations.