12 billion is 12,000 million, in the US and present UK Short Scale.
12 billion is 12,000,000 million, in the former UK Long Scale.
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672,000,000,000
4,000,000,000 multiplied by 3 is equal to 12,000,000,000 (4 billion x 3 = 12 billion)
500000000, using the british billion, 10^9 500000000000, using the American billion, 10^12
12
380 quadrillion. --------------------------------------- 1 billion = 10 to power 12 (according to SI units) 12 billion = 12 x 10 to power 12 1 year = 86400 x 365 = 31536000 seconds 12 billion = 12 to power 12 x 31536000 = 3.78432 E20 or 378.432 trillion