22131 has 6 divisors (see below), whose sum is σ = 31980. Its totient is φ = 14748.

The previous prime is 22129. The next prime is 22133. The reversal of 22131 is 13122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22129) and next prime (22133).

It is not a de Polignac number, because 22131 - 2¹ = 22129 is a prime.

It is a super-2 number, since 2×22131² = 979562322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2459 = 22131 / (2 + 2 + 1 + 3 + 1).

It is a plaindrome in base 11.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (22133) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1221 + ... + 1238.

It is an arithmetic number, because the mean of its divisors is an integer number (5330).

2²²¹³¹ is an apocalyptic number.

22131 is a deficient number, since it is larger than the sum of its proper divisors (9849).

22131 is a wasteful number, since it uses less digits than its factorization.

22131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2465 (or 2462 counting only the distinct ones).

The product of its digits is 12, while the sum is 9.

The square root of 22131 is about 148.7649152186. The cubic root of 22131 is about 28.0758995157.

Adding to 22131 its reverse (13122), we get a palindrome (35253).

Subtracting from 22131 its reverse (13122), we obtain a palindrome (9009).

It can be divided in two parts, 221 and 31, that added together give a palindrome (252).

The spelling of 22131 in words is "twenty-two thousand, one hundred thirty-one".