89908021 has 4 divisors (see below), whose sum is σ = 102752032. Its totient is φ = 77064012.

The previous prime is 89908003. The next prime is 89908043. The reversal of 89908021 is 12080998.

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 89908021 - 2¹³ = 89899829 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 (89908421) 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, 6421995 + ... + 6422008.

It is an arithmetic number, because the mean of its divisors is an integer number (25688008).

Almost surely, 2^89908021 is an apocalyptic number.

It is an amenable number.

89908021 is a deficient number, since it is larger than the sum of its proper divisors (12844011).

89908021 is a wasteful number, since it uses less digits than its factorization.

89908021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12844010.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 89908021 is about 9481.9840223447. The cubic root of 89908021 is about 447.9877577570.

The spelling of 89908021 in words is "eighty-nine million, nine hundred eight thousand, twenty-one".