21046432 has 24 divisors (see below), whose sum is σ = 45202752. Its totient is φ = 9566400.

The previous prime is 21046429. The next prime is 21046447. The reversal of 21046432 is 23464012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29544 + ... + 30247.

It is an arithmetic number, because the mean of its divisors is an integer number (1883448).

Almost surely, 2^21046432 is an apocalyptic number.

21046432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21046432 is an abundant number, since it is smaller than the sum of its proper divisors (24156320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21046432 is a wasteful number, since it uses less digits than its factorization.

21046432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59812 (or 59804 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21046432 is about 4587.6390442144. The cubic root of 21046432 is about 276.0956050503.

The spelling of 21046432 in words is "twenty-one million, forty-six thousand, four hundred thirty-two".