22123131212 has 72 divisors (see below), whose sum is σ = 48197508576. Its totient is φ = 8652542976.

The previous prime is 22123131211. The next prime is 22123131221. The reversal of 22123131212 is 21213132122.

It is not an unprimeable number, because it can be changed into a prime (22123131211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2879408 + ... + 2887080.

Almost surely, 2^22123131212 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 22123131212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24098754288).

22123131212 is an abundant number, since it is smaller than the sum of its proper divisors (26074377364).

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

22123131212 is a wasteful number, since it uses less digits than its factorization.

22123131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7875 (or 7784 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 22123131212 its reverse (21213132122), we get a palindrome (43336263334).

The spelling of 22123131212 in words is "twenty-two billion, one hundred twenty-three million, one hundred thirty-one thousand, two hundred twelve".