One trillion is a one followed by twelve zeroes.
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The next set of numbers after trillion are quadrillion and quintillion
1 trillion times 1 trillion = 1
1 trillion x 1 trillion is equal to 1 quadrillion. To calculate this, you multiply the two numbers together: 1,000,000,000,000 x 1,000,000,000,000 = 1,000,000,000,000,000,000, which is 1 quadrillion. In scientific notation, this would be written as 1 x 10^15.
1 trillion times 1 million is equal to 1 quintillion. To calculate this, you multiply the two numbers together: 1,000,000 (1 million) multiplied by 1,000,000,000,000 (1 trillion) equals 1,000,000,000,000,000,000, which is 1 quintillion. This large number represents the product of multiplying a million by a trillion.
It is: 15,000,000,000,000 = 15 trillion