22112312012 has 48 divisors (see below), whose sum is σ = 47020615488. Its totient is φ = 8882196480.

The previous prime is 22112311999. The next prime is 22112312017. The reversal of 22112312012 is 21021321122.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (22112312017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18338 + ... + 211094.

It is an arithmetic number, because the mean of its divisors is an integer number (979596156).

Almost surely, 2^22112312012 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 22112312012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23510307744).

22112312012 is an abundant number, since it is smaller than the sum of its proper divisors (24908303476).

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

22112312012 is a wasteful number, since it uses less digits than its factorization.

22112312012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193026 (or 193024 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 22112312012 its reverse (21021321122), we get a palindrome (43133633134).

The spelling of 22112312012 in words is "twenty-two billion, one hundred twelve million, three hundred twelve thousand, twelve".