22131212232 has 128 divisors (see below), whose sum is σ = 58492108800. Its totient is φ = 6967564800.

The previous prime is 22131212231. The next prime is 22131212249. The reversal of 22131212232 is 23221213122.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22131212199 and 22131212208.

It is not an unprimeable number, because it can be changed into a prime (22131212231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17168644 + ... + 17169932.

It is an arithmetic number, because the mean of its divisors is an integer number (456969600).

Almost surely, 2^22131212232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22131212232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29246054400).

22131212232 is an abundant number, since it is smaller than the sum of its proper divisors (36360896568).

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

22131212232 is a wasteful number, since it uses less digits than its factorization.

22131212232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867 (or 1863 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 22131212232 its reverse (23221213122), we get a palindrome (45352425354).

The spelling of 22131212232 in words is "twenty-two billion, one hundred thirty-one million, two hundred twelve thousand, two hundred thirty-two".