Sentillion is not a place value. I'm going to assume you mean septillion, in which case the next place value is octillion.
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It is 100000.
Negative numbers, possibly. And, by the way, there is no such word as "gazillion".
458
23 Prime numbers are odd numbers and 21=3x7
A half belongs to the positive fractions family, which comes under fractions, which comes under the large family of rational numbers.