22131155532 has 12 divisors (see below), whose sum is σ = 51639362936. Its totient is φ = 7377051840.

The previous prime is 22131155491. The next prime is 22131155539. The reversal of 22131155532 is 23555113122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 22131155532.

It is not an unprimeable number, because it can be changed into a prime (22131155539) 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, 922131469 + ... + 922131492.

Almost surely, 2^22131155532 is an apocalyptic number.

It is an amenable number.

22131155532 is an abundant number, since it is smaller than the sum of its proper divisors (29508207404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22131155532 is a wasteful number, since it uses less digits than its factorization.

22131155532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844262968 (or 1844262966 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

Adding to 22131155532 its reverse (23555113122), we get a palindrome (45686268654).

The spelling of 22131155532 in words is "twenty-two billion, one hundred thirty-one million, one hundred fifty-five thousand, five hundred thirty-two".