What comes after trillion?

The number that comes after trillion is quadrillion. In the American system of numeration, a trillion is 1 followed by 12 zeros, while a quadrillion is 1 followed by 15 zeros.

Explanation

The number that comes after trillion is quadrillion. In the short scale system, which is used in the United States, Canada, and modern English-speaking countries, one quadrillion is equal to 1,000,000,000,000,000 (10^15). In the long scale system, which is used in many European countries, one quadrillion is equal to 1,000,000,000,000,000,000, which is also known as a million billion (10^18).

To further expand the scale, the next numbers in the short scale system are quintillion (10^18), sextillion (10^21), septillion (10^24), octillion (10^27), nonillion (10^30), decillion (10^33), and so on. In the long scale system, the numbers are slightly different due to the use of the “bi-” prefix, which means “two,” as opposed to “tri-” meaning “three” in the short scale system. The long scale continues with billion trillion (10^18), trillion trillion (10^24), quadrillion trillion (10^30), and so on.

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