22131222012 has 72 divisors (see below), whose sum is σ = 58468999680. Its totient is φ = 7044982560.

The previous prime is 22131222011. The next prime is 22131222019. The reversal of 22131222012 is 21022213122.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131222011) 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, 501289 + ... + 543647.

It is an arithmetic number, because the mean of its divisors is an integer number (812069440).

Almost surely, 2^22131222012 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 22131222012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29234499840).

22131222012 is an abundant number, since it is smaller than the sum of its proper divisors (36337777668).

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

22131222012 is a wasteful number, since it uses less digits than its factorization.

22131222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43023 (or 43018 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 22131222012 its reverse (21022213122), we get a palindrome (43153435134).

The spelling of 22131222012 in words is "twenty-two billion, one hundred thirty-one million, two hundred twenty-two thousand, twelve".