21135332 has 12 divisors (see below), whose sum is σ = 37019136. Its totient is φ = 10558440.

The previous prime is 21135329. The next prime is 21135337. The reversal of 21135332 is 23353112.

It is not an unprimeable number, because it can be changed into a prime (21135337) 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, 7193 + ... + 9695.

It is an arithmetic number, because the mean of its divisors is an integer number (3084928).

Almost surely, 2^21135332 is an apocalyptic number.

It is an amenable number.

21135332 is a deficient number, since it is larger than the sum of its proper divisors (15883804).

21135332 is a wasteful number, since it uses less digits than its factorization.

21135332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4618 (or 4616 counting only the distinct ones).

The product of its digits is 540, while the sum is 20.

The square root of 21135332 is about 4597.3179137406. The cubic root of 21135332 is about 276.4838010320.

Adding to 21135332 its reverse (23353112), we get a palindrome (44488444).

The spelling of 21135332 in words is "twenty-one million, one hundred thirty-five thousand, three hundred thirty-two".