22111212222 has 64 divisors (see below), whose sum is σ = 54094867200. Its totient is φ = 6638876640.

The previous prime is 22111212217. The next prime is 22111212223. The reversal of 22111212222 is 22221211122.

It is a happy number.

22111212222 is a `hidden beast` number, since 221 + 11 + 212 + 222 = 666.

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 junction number, because it is equal to n+sod(n) for n = 22111212195 and 22111212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22111212223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106008 + ... + 235499.

It is an arithmetic number, because the mean of its divisors is an integer number (845232300).

Almost surely, 2^22111212222 is an apocalyptic number.

22111212222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22111212222 is an abundant number, since it is smaller than the sum of its proper divisors (31983654978).

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

22111212222 is a wasteful number, since it uses less digits than its factorization.

22111212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341638 (or 341632 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 22111212222 its reverse (22221211122), we get a palindrome (44332423344).

The spelling of 22111212222 in words is "twenty-two billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-two".