22131231131 has 4 divisors (see below), whose sum is σ = 22139916000. Its totient is φ = 22122546264.

The previous prime is 22131231127. The next prime is 22131231233. The reversal of 22131231131 is 13113213122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22131231131 - 2² = 22131231127 is a prime.

It is a super-2 number, since 2×22131231131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22131236131) 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, 4338611 + ... + 4343708.

It is an arithmetic number, because the mean of its divisors is an integer number (5534979000).

Almost surely, 2^22131231131 is an apocalyptic number.

22131231131 is a deficient number, since it is larger than the sum of its proper divisors (8684869).

22131231131 is an equidigital number, since it uses as much as digits as its factorization.

22131231131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684868.

The product of its digits is 216, while the sum is 20.

Adding to 22131231131 its reverse (13113213122), we get a palindrome (35244444253).

The spelling of 22131231131 in words is "twenty-two billion, one hundred thirty-one million, two hundred thirty-one thousand, one hundred thirty-one".