21075232 has 12 divisors (see below), whose sum is σ = 41491926. Its totient is φ = 10537600.

The previous prime is 21075227. The next prime is 21075239. The reversal of 21075232 is 23257012.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 318096 = 4556^2 + 564^2 .

It is not an unprimeable number, because it can be changed into a prime (21075239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329269 + ... + 329332.

Almost surely, 2^21075232 is an apocalyptic number.

It is an amenable number.

21075232 is a deficient number, since it is larger than the sum of its proper divisors (20416694).

21075232 is an equidigital number, since it uses as much as digits as its factorization.

21075232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658611 (or 658603 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21075232 is about 4590.7768405794. The cubic root of 21075232 is about 276.2214843316.

The spelling of 21075232 in words is "twenty-one million, seventy-five thousand, two hundred thirty-two".