22521312012 has 24 divisors (see below), whose sum is σ = 52675156800. Its totient is φ = 7489185616.

The previous prime is 22521312007. The next prime is 22521312019. The reversal of 22521312012 is 21021312522.

It is a self number, because there is not a number n which added to its sum of digits gives 22521312012.

It is not an unprimeable number, because it can be changed into a prime (22521312019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2234562 + ... + 2244617.

It is an arithmetic number, because the mean of its divisors is an integer number (2194798200).

Almost surely, 2^22521312012 is an apocalyptic number.

It is an amenable number.

22521312012 is an abundant number, since it is smaller than the sum of its proper divisors (30153844788).

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

22521312012 is a wasteful number, since it uses less digits than its factorization.

22521312012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479605 (or 4479603 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 22521312012 its reverse (21021312522), we get a palindrome (43542624534).

The spelling of 22521312012 in words is "twenty-two billion, five hundred twenty-one million, three hundred twelve thousand, twelve".