21418832 has 20 divisors (see below), whose sum is σ = 41890176. Its totient is φ = 10608480.

The previous prime is 21418823. The next prime is 21418841. The reversal of 21418832 is 23881412.

It is an interprime number because it is at equal distance from previous prime (21418823) and next prime (21418841).

It is a junction number, because it is equal to n+sod(n) for n = 21418795 and 21418804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4544 + ... + 7967.

Almost surely, 2^21418832 is an apocalyptic number.

It is an amenable number.

21418832 is a deficient number, since it is larger than the sum of its proper divisors (20471344).

21418832 is a wasteful number, since it uses less digits than its factorization.

21418832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12626 (or 12620 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 21418832 is about 4628.0484007841. The cubic root of 21418832 is about 277.7145250230.

The spelling of 21418832 in words is "twenty-one million, four hundred eighteen thousand, eight hundred thirty-two".