99921028 has 12 divisors (see below), whose sum is σ = 175078540. Its totient is φ = 49898592.

The previous prime is 99921011. The next prime is 99921047. The reversal of 99921028 is 82012999.

It can be written as a sum of positive squares in 2 ways, for example, as 43850884 + 56070144 = 6622^2 + 7488^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11751 + ... + 18382.

Almost surely, 2^99921028 is an apocalyptic number.

It is an amenable number.

99921028 is a deficient number, since it is larger than the sum of its proper divisors (75157512).

99921028 is a wasteful number, since it uses less digits than its factorization.

99921028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30966 (or 30964 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 99921028 is about 9996.0506201199. The cubic root of 99921028 is about 464.0366659987.

The spelling of 99921028 in words is "ninety-nine million, nine hundred twenty-one thousand, twenty-eight".