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The number, 22 billion, has 2 significant digits: 22.
Another Answer: Googol = 10 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 or 10^100 Googolplex = 10googol Googolplex would have a Googol of zeros after a 1, which is to say the number of digits in a Googolplex = Googol+1 digits. You cant even fit a googolplex grains of salt in this universe but maybe in another larger one and you would find duplicates of yourself
9999
1000: from 000 to 9991000: from 000 to 9991000: from 000 to 9991000: from 000 to 999
1 180 000 1,180,000 or 1.18 x 106