12122222122111 has 4 divisors (see below), whose sum is σ = 12122229258000. Its totient is φ = 12122214986224.

The previous prime is 12122222122099. The next prime is 12122222122123. The reversal of 12122222122111 is 11122122222121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (12122222122099) and next prime (12122222122123).

It is a cyclic number.

It is not a de Polignac number, because 12122222122111 - 2⁹ = 12122222121599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122222123111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614355 + ... + 4962043.

It is an arithmetic number, because the mean of its divisors is an integer number (3030557314500).

Almost surely, 2^{12122222122111} is an apocalyptic number.

12122222122111 is a deficient number, since it is larger than the sum of its proper divisors (7135889).

12122222122111 is an equidigital number, since it uses as much as digits as its factorization.

12122222122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135888.

The product of its digits is 256, while the sum is 22.

Adding to 12122222122111 its reverse (11122122222121), we get a palindrome (23244344344232).

It can be divided in two parts, 1212222 and 2122111, that added together give a palindrome (3334333).

The spelling of 12122222122111 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-two thousand, one hundred eleven".