21316232 has 32 divisors (see below), whose sum is σ = 48366720. Its totient is φ = 8597760.

The previous prime is 21316231. The next prime is 21316237. The reversal of 21316232 is 23261312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21316231) 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, 10244 + ... + 12147.

It is an arithmetic number, because the mean of its divisors is an integer number (1511460).

Almost surely, 2^21316232 is an apocalyptic number.

It is an amenable number.

21316232 is an abundant number, since it is smaller than the sum of its proper divisors (27050488).

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

21316232 is a wasteful number, since it uses less digits than its factorization.

21316232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22421 (or 22417 counting only the distinct ones).

The product of its digits is 432, while the sum is 20.

The square root of 21316232 is about 4616.9505087233. The cubic root of 21316232 is about 277.2703811647.

Adding to 21316232 its reverse (23261312), we get a palindrome (44577544).

The spelling of 21316232 in words is "twenty-one million, three hundred sixteen thousand, two hundred thirty-two".