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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
500 billion X 10 = 5 trillion. 500,000,000,000 X 10 = 5,000,000,000,000
20 million × 5 billion = 100,000 trillion = 100 quadrillion on the short scale. 20 million × 5 billion = 100 trillion on the long scale.
"Half a trillion" or 500 billion would be written exponentially 5 x 10^11 (5 times 10 to the 11th power).On the US "short scale" the value 1 trillion is 1,000,000,000,000 and the scientific notation is 1 x 10^12.(10 to the twelfth power)