99384921 has 16 divisors (see below), whose sum is σ = 149653120. Its totient is φ = 65169360.

The previous prime is 99384899. The next prime is 99384949. The reversal of 99384921 is 12948399.

It is not a de Polignac number, because 99384921 - 2⁷ = 99384793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99384221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28525 + ... + 31818.

It is an arithmetic number, because the mean of its divisors is an integer number (9353320).

Almost surely, 2^99384921 is an apocalyptic number.

It is an amenable number.

99384921 is a deficient number, since it is larger than the sum of its proper divisors (50268199).

99384921 is a wasteful number, since it uses less digits than its factorization.

99384921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60413 (or 60407 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 99384921 is about 9969.1986137302. The cubic root of 99384921 is about 463.2052775983.

The spelling of 99384921 in words is "ninety-nine million, three hundred eighty-four thousand, nine hundred twenty-one".