21136232 has 16 divisors (see below), whose sum is σ = 42679140. Its totient is φ = 9755136.

The previous prime is 21136217. The next prime is 21136237. The reversal of 21136232 is 23263112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20124196 + 1012036 = 4486^2 + 1006^2 .

It is not an unprimeable number, because it can be changed into a prime (21136237) 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, 101513 + ... + 101720.

Almost surely, 2^21136232 is an apocalyptic number.

It is an amenable number.

21136232 is an abundant number, since it is smaller than the sum of its proper divisors (21542908).

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

21136232 is a wasteful number, since it uses less digits than its factorization.

21136232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203252 (or 203248 counting only the distinct ones).

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

The square root of 21136232 is about 4597.4157958575. The cubic root of 21136232 is about 276.4877254540.

Adding to 21136232 its reverse (23263112), we get a palindrome (44399344).

The spelling of 21136232 in words is "twenty-one million, one hundred thirty-six thousand, two hundred thirty-two".