Ok first, 1 zillion is not a number, people just made that up.
Second, the number that comes after on BILLION is two billion.
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a zillion and 1
999 zillion and 1
999 million and one. If you meant adding another million, you get a thousand million - usually called a billion.
yes, after 100 millions comes 1 billion not 1 thousand million......... :P
1 billion = 1,000 million 1/2 billion = 500 million