Number of zeros U.S. & scientific community Other countries 3 thousand thousand 6 million million 9 billion 1000 million (1 milliard) 12 trillion billion 15 quadrillion 1000 billion 18 quintillion trillion 21 sextillion 1000 trillion 24 septillion quadrillion 27 octillion 1000 quadrillion 30 nonillion quintillion 33 decillion 1000 quintillion 36 undecillion sextillion 39 duodecillion 1000 …

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