12112171121 has 4 divisors (see below), whose sum is σ = 12135330672. Its totient is φ = 12089011572.

The previous prime is 12112171109. The next prime is 12112171171. The reversal of 12112171121 is 12117121121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12117121121 = 7 ⋅1731017303.

It is a cyclic number.

It is not a de Polignac number, because 12112171121 - 2¹⁴ = 12112154737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112171093 and 12112171102.

It is not an unprimeable number, because it can be changed into a prime (12112171171) 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, 11578991 + ... + 11580036.

It is an arithmetic number, because the mean of its divisors is an integer number (3033832668).

Almost surely, 2^12112171121 is an apocalyptic number.

It is an amenable number.

12112171121 is a deficient number, since it is larger than the sum of its proper divisors (23159551).

12112171121 is an equidigital number, since it uses as much as digits as its factorization.

12112171121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23159550.

The product of its digits is 56, while the sum is 20.

Adding to 12112171121 its reverse (12117121121), we get a palindrome (24229292242).

The spelling of 12112171121 in words is "twelve billion, one hundred twelve million, one hundred seventy-one thousand, one hundred twenty-one".