21932331 has 8 divisors (see below), whose sum is σ = 29348304. Its totient is φ = 14568960.

The previous prime is 21932269. The next prime is 21932341. The reversal of 21932331 is 13323912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21932331 - 2⁷ = 21932203 is a prime.

It is a super-2 number, since 2×21932331² = 962054286187122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21932341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12166 + ... + 13851.

It is an arithmetic number, because the mean of its divisors is an integer number (3668538).

Almost surely, 2^21932331 is an apocalyptic number.

21932331 is a deficient number, since it is larger than the sum of its proper divisors (7415973).

21932331 is a wasteful number, since it uses less digits than its factorization.

21932331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26301.

The product of its digits is 972, while the sum is 24.

The square root of 21932331 is about 4683.1966646725. The cubic root of 21932331 is about 279.9163483104.

The spelling of 21932331 in words is "twenty-one million, nine hundred thirty-two thousand, three hundred thirty-one".