21045232 has 60 divisors (see below), whose sum is σ = 45429384. Its totient is φ = 9434880.

The previous prime is 21045229. The next prime is 21045239. The reversal of 21045232 is 23254012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21045239) 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, 116182 + ... + 116362.

Almost surely, 2^21045232 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 21045232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22714692).

21045232 is an abundant number, since it is smaller than the sum of its proper divisors (24384152).

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

21045232 is a wasteful number, since it uses less digits than its factorization.

21045232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21045232 is about 4587.5082561234. The cubic root of 21045232 is about 276.0903575888.

Adding to 21045232 its reverse (23254012), we get a palindrome (44299244).

The spelling of 21045232 in words is "twenty-one million, forty-five thousand, two hundred thirty-two".