21607232 has 28 divisors (see below), whose sum is σ = 43525440. Its totient is φ = 10640256.

The previous prime is 21607231. The next prime is 21607241. The reversal of 21607232 is 23270612.

It is a junction number, because it is equal to n+sod(n) for n = 21607198 and 21607207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21607231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1769 + ... + 6807.

It is an arithmetic number, because the mean of its divisors is an integer number (1554480).

Almost surely, 2^21607232 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 21607232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21762720).

21607232 is an abundant number, since it is smaller than the sum of its proper divisors (21918208).

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

21607232 is an equidigital number, since it uses as much as digits as its factorization.

21607232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118 (or 5108 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21607232 is about 4648.3579896561. The cubic root of 21607232 is about 278.5264080027.

Adding to 21607232 its reverse (23270612), we get a palindrome (44877844).

The spelling of 21607232 in words is "twenty-one million, six hundred seven thousand, two hundred thirty-two".