21122432 has 48 divisors (see below), whose sum is σ = 44779020. Its totient is φ = 9922560.

The previous prime is 21122419. The next prime is 21122443. The reversal of 21122432 is 23422112.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21122432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36707 + ... + 37277.

Almost surely, 2^21122432 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 21122432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22389510).

21122432 is an abundant number, since it is smaller than the sum of its proper divisors (23656588).

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

21122432 is an equidigital number, since it uses as much as digits as its factorization.

21122432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619 (or 590 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 21122432 is about 4595.9147076507. The cubic root of 21122432 is about 276.4275387360.

Adding to 21122432 its reverse (23422112), we get a palindrome (44544544).

The spelling of 21122432 in words is "twenty-one million, one hundred twenty-two thousand, four hundred thirty-two".