21832731 has 12 divisors (see below), whose sum is σ = 31768152. Its totient is φ = 14448096.

The previous prime is 21832703. The next prime is 21832751. The reversal of 21832731 is 13723812.

It is not a de Polignac number, because 21832731 - 2⁶ = 21832667 is a prime.

It is a super-2 number, since 2×21832731² = 953336285836722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21832695 and 21832704.

It is not an unprimeable number, because it can be changed into a prime (21832751) 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 11 ways as a sum of consecutive naturals, for example, 7621 + ... + 10086.

It is an arithmetic number, because the mean of its divisors is an integer number (2647346).

Almost surely, 2^21832731 is an apocalyptic number.

21832731 is a deficient number, since it is larger than the sum of its proper divisors (9935421).

21832731 is a wasteful number, since it uses less digits than its factorization.

21832731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17850 (or 17847 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21832731 is about 4672.5508022920. The cubic root of 21832731 is about 279.4919827493.

The spelling of 21832731 in words is "twenty-one million, eight hundred thirty-two thousand, seven hundred thirty-one".