21124032 has 56 divisors (see below), whose sum is σ = 56235600. Its totient is φ = 6998016.

The previous prime is 21124031. The next prime is 21124063. The reversal of 21124032 is 23042112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51444 + ... + 51852.

Almost surely, 2^21124032 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 21124032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28117800).

21124032 is an abundant number, since it is smaller than the sum of its proper divisors (35111568).

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

21124032 is a wasteful number, since it uses less digits than its factorization.

21124032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21124032 is about 4596.0887719886. The cubic root of 21124032 is about 276.4345182494.

Adding to 21124032 its reverse (23042112), we get a palindrome (44166144).

The spelling of 21124032 in words is "twenty-one million, one hundred twenty-four thousand, thirty-two".