22201021312 has 64 divisors (see below), whose sum is σ = 44526867840. Its totient is φ = 11025907200.

The previous prime is 22201021301. The next prime is 22201021313. The reversal of 22201021312 is 21312010222.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22201021313) 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, 21123187 + ... + 21124237.

It is an arithmetic number, because the mean of its divisors is an integer number (695732310).

Almost surely, 2^22201021312 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 22201021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22263433920).

22201021312 is an abundant number, since it is smaller than the sum of its proper divisors (22325846528).

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

22201021312 is a wasteful number, since it uses less digits than its factorization.

22201021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019 (or 2007 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22201021312 its reverse (21312010222), we get a palindrome (43513031534).

The spelling of 22201021312 in words is "twenty-two billion, two hundred one million, twenty-one thousand, three hundred twelve".