212222211222 has 32 divisors (see below), whose sum is σ = 488569132800. Its totient is φ = 60198693408.

The previous prime is 212222211209. The next prime is 212222211293. The reversal of 212222211222 is 222112222212.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18170097 + ... + 18181772.

It is an arithmetic number, because the mean of its divisors is an integer number (15267785400).

Almost surely, 2^212222211222 is an apocalyptic number.

212222211222 is an abundant number, since it is smaller than the sum of its proper divisors (276346921578).

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

212222211222 is a wasteful number, since it uses less digits than its factorization.

212222211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36352020.

The product of its digits is 512, while the sum is 21.

Adding to 212222211222 its reverse (222112222212), we get a palindrome (434334433434).

The spelling of 212222211222 in words is "two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty-two".