22331 has 4 divisors (see below), whose sum is σ = 22632. Its totient is φ = 22032.

The previous prime is 22307. The next prime is 22343. The reversal of 22331 is 13322.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13322 = 2 ⋅6661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22331 is a prime.

It is a super-2 number, since 2×22331² = 997347122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 218.

It is an arithmetic number, because the mean of its divisors is an integer number (5658).

2²²³³¹ is an apocalyptic number.

22331 is a deficient number, since it is larger than the sum of its proper divisors (301).

22331 is a wasteful number, since it uses less digits than its factorization.

22331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300.

The product of its digits is 36, while the sum is 11.

The square root of 22331 is about 149.4356048604. The cubic root of 22331 is about 28.1602208951.

Adding to 22331 its reverse (13322), we get a palindrome (35653).

Subtracting from 22331 its reverse (13322), we obtain a palindrome (9009).

It can be divided in two parts, 22 and 331, that added together give a palindrome (353).

The spelling of 22331 in words is "twenty-two thousand, three hundred thirty-one".