89981421 has 4 divisors (see below), whose sum is σ = 119975232. Its totient is φ = 59987612.

The previous prime is 89981417. The next prime is 89981443. The reversal of 89981421 is 12418998.

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 89981421 - 2² = 89981417 is a prime.

It is a super-2 number, since 2×89981421² = 16193312250358482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89981491) 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, 14996901 + ... + 14996906.

It is an arithmetic number, because the mean of its divisors is an integer number (29993808).

Almost surely, 2^89981421 is an apocalyptic number.

It is an amenable number.

89981421 is a deficient number, since it is larger than the sum of its proper divisors (29993811).

89981421 is a wasteful number, since it uses less digits than its factorization.

89981421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29993810.

The product of its digits is 41472, while the sum is 42.

The square root of 89981421 is about 9485.8537306876. The cubic root of 89981421 is about 448.1096354895.

The spelling of 89981421 in words is "eighty-nine million, nine hundred eighty-one thousand, four hundred twenty-one".