22221112212 has 96 divisors (see below), whose sum is σ = 62656527360. Its totient is φ = 6769526400.

The previous prime is 22221112157. The next prime is 22221112231. The reversal of 22221112212 is 21221112222.

It is a happy number.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63453 + ... + 220155.

It is an arithmetic number, because the mean of its divisors is an integer number (652672160).

Almost surely, 2^22221112212 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 22221112212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31328263680).

22221112212 is an abundant number, since it is smaller than the sum of its proper divisors (40435415148).

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

22221112212 is a wasteful number, since it uses less digits than its factorization.

22221112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156830 (or 156822 counting only the distinct ones).

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

Adding to 22221112212 its reverse (21221112222), we get a palindrome (43442224434).

The spelling of 22221112212 in words is "twenty-two billion, two hundred twenty-one million, one hundred twelve thousand, two hundred twelve".