12112111212121 has 2 divisors, whose sum is σ = 12112111212122. Its totient is φ = 12112111212120.

The previous prime is 12112111212083. The next prime is 12112111212127. The reversal of 12112111212121 is 12121211121121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12012358833225 + 99752378896 = 3465885^2 + 315836^2 .

It is a cyclic number.

It is not a de Polignac number, because 12112111212121 - 2²¹ = 12112109114969 is a prime.

It is not a weakly prime, because it can be changed into another prime (12112111212127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6056055606060 + 6056055606061.

It is an arithmetic number, because the mean of its divisors is an integer number (6056055606061).

Almost surely, 2^{12112111212121} is an apocalyptic number.

It is an amenable number.

12112111212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12112111212121 is an equidigital number, since it uses as much as digits as its factorization.

12112111212121 is an evil number, because the sum of its binary digits is even.

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

Adding to 12112111212121 its reverse (12121211121121), we get a palindrome (24233322333242).

The spelling of 12112111212121 in words is "twelve trillion, one hundred twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".