21268832 has 96 divisors (see below), whose sum is σ = 48898080. Its totient is φ = 9031680.

The previous prime is 21268829. The next prime is 21268837. The reversal of 21268832 is 23886212.

It is a Harshad number since it is a multiple of its sum of digits (32).

Its product of digits (9216) is a multiple of the sum of its prime divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21268837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494603 + ... + 494645.

It is an arithmetic number, because the mean of its divisors is an integer number (509355).

Almost surely, 2^21268832 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21268832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24449040).

21268832 is an abundant number, since it is smaller than the sum of its proper divisors (27629248).

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

21268832 is a wasteful number, since it uses less digits than its factorization.

21268832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 128 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 21268832 is about 4611.8143934898. The cubic root of 21268832 is about 277.0647105178.

The spelling of 21268832 in words is "twenty-one million, two hundred sixty-eight thousand, eight hundred thirty-two".