21532732 has 48 divisors (see below), whose sum is σ = 42688800. Its totient is φ = 9434880.

The previous prime is 21532717. The next prime is 21532733. The reversal of 21532732 is 23723512.

It is a junction number, because it is equal to n+sod(n) for n = 21532697 and 21532706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164307 + ... + 164437.

It is an arithmetic number, because the mean of its divisors is an integer number (889350).

Almost surely, 2^21532732 is an apocalyptic number.

It is an amenable number.

21532732 is a deficient number, since it is larger than the sum of its proper divisors (21156068).

21532732 is a wasteful number, since it uses less digits than its factorization.

21532732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 284 counting only the distinct ones).

The product of its digits is 2520, while the sum is 25.

The square root of 21532732 is about 4640.3374877265. The cubic root of 21532732 is about 278.2059271633.

The spelling of 21532732 in words is "twenty-one million, five hundred thirty-two thousand, seven hundred thirty-two".