22131112212 has 72 divisors (see below), whose sum is σ = 61657482432. Its totient is φ = 6637248000.

The previous prime is 22131112183. The next prime is 22131112217. The reversal of 22131112212 is 21221113122.

22131112212 is a `hidden beast` number, since 221 + 311 + 122 + 12 = 666.

It is a super-2 number, since 2×22131112212² (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131112217) 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, 249664 + ... + 326487.

Almost surely, 2^22131112212 is an apocalyptic number.

22131112212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22131112212 is an abundant number, since it is smaller than the sum of its proper divisors (39526370220).

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

22131112212 is a wasteful number, since it uses less digits than its factorization.

22131112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576269 (or 576264 counting only the distinct ones).

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

Adding to 22131112212 its reverse (21221113122), we get a palindrome (43352225334).

The spelling of 22131112212 in words is "twenty-two billion, one hundred thirty-one million, one hundred twelve thousand, two hundred twelve".