21465232 has 10 divisors (see below), whose sum is σ = 41588918. Its totient is φ = 10732608.

The previous prime is 21465221. The next prime is 21465239. The reversal of 21465232 is 23256412.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 5973136 = 3936^2 + 2444^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21465197 and 21465206.

It is not an unprimeable number, because it can be changed into a prime (21465239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670773 + ... + 670804.

Almost surely, 2^21465232 is an apocalyptic number.

It is an amenable number.

21465232 is a deficient number, since it is larger than the sum of its proper divisors (20123686).

21465232 is a wasteful number, since it uses less digits than its factorization.

21465232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341585 (or 1341579 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 21465232 is about 4633.0586009676. The cubic root of 21465232 is about 277.9149197056.

The spelling of 21465232 in words is "twenty-one million, four hundred sixty-five thousand, two hundred thirty-two".