90032421 has 4 divisors (see below), whose sum is σ = 120043232. Its totient is φ = 60021612.

The previous prime is 90032399. The next prime is 90032441. The reversal of 90032421 is 12423009.

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 not a de Polignac number, because 90032421 - 2¹⁵ = 89999653 is a prime.

It is a super-2 number, since 2×90032421² = 16211673662242482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90032441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15005401 + ... + 15005406.

It is an arithmetic number, because the mean of its divisors is an integer number (30010808).

Almost surely, 2^90032421 is an apocalyptic number.

It is an amenable number.

90032421 is a deficient number, since it is larger than the sum of its proper divisors (30010811).

90032421 is a wasteful number, since it uses less digits than its factorization.

90032421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30010810.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 90032421 is about 9488.5415633805. The cubic root of 90032421 is about 448.1942799077.

The spelling of 90032421 in words is "ninety million, thirty-two thousand, four hundred twenty-one".