22121211312 has 60 divisors (see below), whose sum is σ = 63581890320. Its totient is φ = 7174445184.

The previous prime is 22121211289. The next prime is 22121211319. The reversal of 22121211312 is 21311212122.

22121211312 is a `hidden beast` number, since 22 + 121 + 211 + 312 = 666.

It is a super-2 number, since 2×22121211312² (a number of 21 digits) contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (22121211319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2070612 + ... + 2081267.

It is an arithmetic number, because the mean of its divisors is an integer number (1059698172).

Almost surely, 2^22121211312 is an apocalyptic number.

It is an amenable number.

22121211312 is an abundant number, since it is smaller than the sum of its proper divisors (41460679008).

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

22121211312 is a wasteful number, since it uses less digits than its factorization.

22121211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151930 (or 4151921 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 22121211312 its reverse (21311212122), we get a palindrome (43432423434).

The spelling of 22121211312 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, three hundred twelve".