22221112111212 has 192 divisors, whose sum is σ = 64059048668160. Its totient is φ = 5851166367744.

The previous prime is 22221112111123. The next prime is 22221112111217. The reversal of 22221112111212 is 21211121112222.

It is a super-2 number, since 2×22221112111212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 (22221112111217) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13723138 + ... + 15256694.

It is an arithmetic number, because the mean of its divisors is an integer number (333640878480).

Almost surely, 2^{22221112111212} 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 22221112111212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32029524334080).

22221112111212 is an abundant number, since it is smaller than the sum of its proper divisors (41837936556948).

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

22221112111212 is a wasteful number, since it uses less digits than its factorization.

22221112111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1533800 (or 1533798 counting only the distinct ones).

The product of its digits is 128, while the sum is 21.

Adding to 22221112111212 its reverse (21211121112222), we get a palindrome (43432233223434).

The spelling of 22221112111212 in words is "twenty-two trillion, two hundred twenty-one billion, one hundred twelve million, one hundred eleven thousand, two hundred twelve".