89218921 has 16 divisors (see below), whose sum is σ = 99505728. Its totient is φ = 79315200.

The previous prime is 89218919. The next prime is 89218931. The reversal of 89218921 is 12981298.

It is a cyclic number.

It is not a de Polignac number, because 89218921 - 2¹ = 89218919 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89218901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109606 + ... + 110416.

It is an arithmetic number, because the mean of its divisors is an integer number (6219108).

Almost surely, 2^89218921 is an apocalyptic number.

It is an amenable number.

89218921 is a deficient number, since it is larger than the sum of its proper divisors (10286807).

89218921 is a wasteful number, since it uses less digits than its factorization.

89218921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its digits is 20736, while the sum is 40.

The square root of 89218921 is about 9445.5767955165. The cubic root of 89218921 is about 446.8402871368.

The spelling of 89218921 in words is "eighty-nine million, two hundred eighteen thousand, nine hundred twenty-one".