12112001111 has 4 divisors (see below), whose sum is σ = 13842286992. Its totient is φ = 10381715232.

The previous prime is 12112001107. The next prime is 12112001129. The reversal of 12112001111 is 11110021121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11110021121 = 3461 ⋅3210061.

It is not a de Polignac number, because 12112001111 - 2² = 12112001107 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112001092 and 12112001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12112001141) 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, 865142930 + ... + 865142943.

It is an arithmetic number, because the mean of its divisors is an integer number (3460571748).

Almost surely, 2^12112001111 is an apocalyptic number.

12112001111 is a deficient number, since it is larger than the sum of its proper divisors (1730285881).

12112001111 is an equidigital number, since it uses as much as digits as its factorization.

12112001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730285880.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12112001111 its reverse (11110021121), we get a palindrome (23222022232).

The spelling of 12112001111 in words is "twelve billion, one hundred twelve million, one thousand, one hundred eleven".