12112131121 has 8 divisors (see below), whose sum is σ = 12231962600. Its totient is φ = 11992458240.

The previous prime is 12112131089. The next prime is 12112131133. The reversal of 12112131121 is 12113121121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173290896 + 11938840225 = 13164^2 + 109265^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12112131121 - 2⁵ = 12112131089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12112131095 and 12112131104.

It is not an unprimeable number, because it can be changed into a prime (12112141121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116881 + ... + 194641.

It is an arithmetic number, because the mean of its divisors is an integer number (1528995325).

Almost surely, 2^12112131121 is an apocalyptic number.

It is an amenable number.

12112131121 is a deficient number, since it is larger than the sum of its proper divisors (119831479).

12112131121 is a wasteful number, since it uses less digits than its factorization.

12112131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79299.

The product of its digits is 24, while the sum is 16.

Adding to 12112131121 its reverse (12113121121), we get a palindrome (24225252242).

The spelling of 12112131121 in words is "twelve billion, one hundred twelve million, one hundred thirty-one thousand, one hundred twenty-one".