12112111222111 has 4 divisors (see below), whose sum is σ = 12529770229800. Its totient is φ = 11694452214424.

The previous prime is 12112111222091. The next prime is 12112111222117. The reversal of 12112111222111 is 11122211121121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12112111222111 - 2⁹ = 12112111221599 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 (12112111222117) 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, 208829503801 + ... + 208829503858.

It is an arithmetic number, because the mean of its divisors is an integer number (3132442557450).

Almost surely, 2^{12112111222111} is an apocalyptic number.

12112111222111 is a deficient number, since it is larger than the sum of its proper divisors (417659007689).

12112111222111 is an equidigital number, since it uses as much as digits as its factorization.

12112111222111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417659007688.

The product of its digits is 32, while the sum is 19.

Adding to 12112111222111 its reverse (11122211121121), we get a palindrome (23234322343232).

The spelling of 12112111222111 in words is "twelve trillion, one hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, one hundred eleven".