21324589 has 12 divisors (see below), whose sum is σ = 25192512. Its totient is φ = 17893200.

The previous prime is 21324571. The next prime is 21324619. The reversal of 21324589 is 98542312.

It is not a de Polignac number, because 21324589 - 2⁵ = 21324557 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 (21324509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3877 + ... + 7594.

It is an arithmetic number, because the mean of its divisors is an integer number (2099376).

Almost surely, 2^21324589 is an apocalyptic number.

It is an amenable number.

21324589 is a deficient number, since it is larger than the sum of its proper divisors (3867923).

21324589 is a wasteful number, since it uses less digits than its factorization.

21324589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11508 (or 11495 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 21324589 is about 4617.8554546456. The cubic root of 21324589 is about 277.3066109235.

The spelling of 21324589 in words is "twenty-one million, three hundred twenty-four thousand, five hundred eighty-nine".