89231021 has 4 divisors (see below), whose sum is σ = 97342944. Its totient is φ = 81119100.

The previous prime is 89231017. The next prime is 89231027. The reversal of 89231021 is 12013298.

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 89231021 - 2² = 89231017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89231027) 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, 4055945 + ... + 4055966.

It is an arithmetic number, because the mean of its divisors is an integer number (24335736).

Almost surely, 2^89231021 is an apocalyptic number.

It is an amenable number.

89231021 is a deficient number, since it is larger than the sum of its proper divisors (8111923).

89231021 is a wasteful number, since it uses less digits than its factorization.

89231021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8111922.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 89231021 is about 9446.2172852417. The cubic root of 89231021 is about 446.8604866005.

It can be divided in two parts, 892 and 31021, that added together give a palindrome (31913).

The spelling of 89231021 in words is "eighty-nine million, two hundred thirty-one thousand, twenty-one".