21532832 has 12 divisors (see below), whose sum is σ = 42392826. Its totient is φ = 10766400.

The previous prime is 21532811. The next prime is 21532837. The reversal of 21532832 is 23823512.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 2835856 = 4324^2 + 1684^2 .

It is not an unprimeable number, because it can be changed into a prime (21532837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336419 + ... + 336482.

Almost surely, 2^21532832 is an apocalyptic number.

It is an amenable number.

21532832 is a deficient number, since it is larger than the sum of its proper divisors (20859994).

21532832 is an equidigital number, since it uses as much as digits as its factorization.

21532832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672911 (or 672903 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 21532832 is about 4640.3482627924. The cubic root of 21532832 is about 278.2063578340.

The spelling of 21532832 in words is "twenty-one million, five hundred thirty-two thousand, eight hundred thirty-two".