22131202231 has 4 divisors (see below), whose sum is σ = 22135178952. Its totient is φ = 22127225512.

The previous prime is 22131202153. The next prime is 22131202243. The reversal of 22131202231 is 13220213122.

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 22131202231 - 2²³ = 22122813623 is a prime.

It is a super-2 number, since 2×22131202231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22131202199 and 22131202208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131202631) 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, 1980001 + ... + 1991146.

It is an arithmetic number, because the mean of its divisors is an integer number (5533794738).

Almost surely, 2^22131202231 is an apocalyptic number.

22131202231 is a deficient number, since it is larger than the sum of its proper divisors (3976721).

22131202231 is an equidigital number, since it uses as much as digits as its factorization.

22131202231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976720.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22131202231 its reverse (13220213122), we get a palindrome (35351415353).

The spelling of 22131202231 in words is "twenty-two billion, one hundred thirty-one million, two hundred two thousand, two hundred thirty-one".