Almost surely, 299921600 is an apocalyptic number.
99921600 is a gapful number since it is divisible by the number (90) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 99921600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184865772).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99921600 is a wasteful number, since it uses less digits than its factorization.
99921600 is an evil number, because the sum of its binary digits is even.
The square root of 99921600 is about 9996.0792313787. The cubic root of 99921600 is about 464.0375514595.
The spelling of 99921600 in words is "ninety-nine million, nine hundred twenty-one thousand, six hundred".