21385324 has 12 divisors (see below), whose sum is σ = 37534000. Its totient is φ = 10661328.

The previous prime is 21385321. The next prime is 21385327. The reversal of 21385324 is 42358312.

It is an interprime number because it is at equal distance from previous prime (21385321) and next prime (21385327).

It is a junction number, because it is equal to n+sod(n) for n = 21385292 and 21385301.

It is not an unprimeable number, because it can be changed into a prime (21385321) 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, 6264 + ... + 9055.

Almost surely, 2^21385324 is an apocalyptic number.

It is an amenable number.

21385324 is a deficient number, since it is larger than the sum of its proper divisors (16148676).

21385324 is a wasteful number, since it uses less digits than its factorization.

21385324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15672 (or 15670 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 21385324 is about 4624.4268834094. The cubic root of 21385324 is about 277.5696289308.

The spelling of 21385324 in words is "twenty-one million, three hundred eighty-five thousand, three hundred twenty-four".