99000921 has 16 divisors (see below), whose sum is σ = 136934336. Its totient is φ = 63576576.

The previous prime is 99000919. The next prime is 99000953. The reversal of 99000921 is 12900099.

It is not a de Polignac number, because 99000921 - 2¹ = 99000919 is a prime.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99000991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4161 + ... + 14673.

It is an arithmetic number, because the mean of its divisors is an integer number (8558396).

Almost surely, 2^99000921 is an apocalyptic number.

It is an amenable number.

99000921 is a deficient number, since it is larger than the sum of its proper divisors (37933415).

99000921 is a wasteful number, since it uses less digits than its factorization.

99000921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10632.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 99000921 is about 9949.9206529500. The cubic root of 99000921 is about 462.6079354613.

The spelling of 99000921 in words is "ninety-nine million, nine hundred twenty-one", and thus it is an aban number.