21832372 has 12 divisors (see below), whose sum is σ = 38601220. Its totient is φ = 10803456.

The previous prime is 21832367. The next prime is 21832379. The reversal of 21832372 is 27323812.

It can be written as a sum of positive squares in 2 ways, for example, as 17522596 + 4309776 = 4186^2 + 2076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21832372.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21832379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27747 + ... + 28522.

Almost surely, 2^21832372 is an apocalyptic number.

It is an amenable number.

21832372 is a deficient number, since it is larger than the sum of its proper divisors (16768848).

21832372 is a wasteful number, since it uses less digits than its factorization.

21832372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56370 (or 56368 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 21832372 is about 4672.5123862864. The cubic root of 21832372 is about 279.4904508265.

The spelling of 21832372 in words is "twenty-one million, eight hundred thirty-two thousand, three hundred seventy-two".