12111211221222 has 32 divisors (see below), whose sum is σ = 26186402649600. Its totient is φ = 3721225637088.

The previous prime is 12111211221191. The next prime is 12111211221271. The reversal of 12111211221222 is 22212211211121.

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, 1435653822 + ... + 1435662257.

It is an arithmetic number, because the mean of its divisors is an integer number (818325082800).

Almost surely, 2^{12111211221222} is an apocalyptic number.

12111211221222 is an abundant number, since it is smaller than the sum of its proper divisors (14075191428378).

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

12111211221222 is a wasteful number, since it uses less digits than its factorization.

12111211221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2871316140.

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

Adding to 12111211221222 its reverse (22212211211121), we get a palindrome (34323422432343).

The spelling of 12111211221222 in words is "twelve trillion, one hundred eleven billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-two".