99990321 has 4 divisors (see below), whose sum is σ = 133320432. Its totient is φ = 66660212.

The previous prime is 99990307. The next prime is 99990329. The reversal of 99990321 is 12309999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99990321 - 2¹⁵ = 99957553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99990329) 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 3 ways as a sum of consecutive naturals, for example, 16665051 + ... + 16665056.

It is an arithmetic number, because the mean of its divisors is an integer number (33330108).

Almost surely, 2^99990321 is an apocalyptic number.

It is an amenable number.

99990321 is a deficient number, since it is larger than the sum of its proper divisors (33330111).

99990321 is a wasteful number, since it uses less digits than its factorization.

99990321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33330110.

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 99990321 is about 9999.5160382891. The cubic root of 99990321 is about 464.1439075653.

The spelling of 99990321 in words is "ninety-nine million, nine hundred ninety thousand, three hundred twenty-one".