12112112121 has 8 divisors (see below), whose sum is σ = 16168330464. Its totient is φ = 8065317600.

The previous prime is 12112112119. The next prime is 12112112123. The reversal of 12112112121 is 12121121121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12112112119) and next prime (12112112123).

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

It is not a de Polignac number, because 12112112121 - 2¹ = 12112112119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12112112121.

It is not an unprimeable number, because it can be changed into a prime (12112112123) 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, 2352955 + ... + 2358096.

It is an arithmetic number, because the mean of its divisors is an integer number (2021041308).

Almost surely, 2^12112112121 is an apocalyptic number.

It is an amenable number.

12112112121 is a deficient number, since it is larger than the sum of its proper divisors (4056218343).

12112112121 is an equidigital number, since it uses as much as digits as its factorization.

12112112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4711911.

The product of its digits is 16, while the sum is 15.

Adding to 12112112121 its reverse (12121121121), we get a palindrome (24233233242).

The spelling of 12112112121 in words is "twelve billion, one hundred twelve million, one hundred twelve thousand, one hundred twenty-one".