21622589 has 8 divisors (see below), whose sum is σ = 24099840. Its totient is φ = 19279296.

The previous prime is 21622583. The next prime is 21622591. The reversal of 21622589 is 98522612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21622589 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 (21622583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33149 + ... + 33794.

It is an arithmetic number, because the mean of its divisors is an integer number (3012480).

Almost surely, 2^21622589 is an apocalyptic number.

It is an amenable number.

21622589 is a deficient number, since it is larger than the sum of its proper divisors (2477251).

21622589 is a wasteful number, since it uses less digits than its factorization.

21622589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66979.

The product of its digits is 17280, while the sum is 35.

The square root of 21622589 is about 4650.0095698826. The cubic root of 21622589 is about 278.5923784626.

The spelling of 21622589 in words is "twenty-one million, six hundred twenty-two thousand, five hundred eighty-nine".