12012111121 has 2 divisors, whose sum is σ = 12012111122. Its totient is φ = 12012111120.

The previous prime is 12012111119. The next prime is 12012111143. The reversal of 12012111121 is 12111121021.

It is a happy number.

12012111121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6965571600 + 5046539521 = 83460^2 + 71039^2 .

It is an emirp because it is prime and its reverse (12111121021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12012111121 - 2¹ = 12012111119 is a prime.

Together with 12012111119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12012111101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006055560 + 6006055561.

It is an arithmetic number, because the mean of its divisors is an integer number (6006055561).

Almost surely, 2^12012111121 is an apocalyptic number.

It is an amenable number.

12012111121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012111121 is an equidigital number, since it uses as much as digits as its factorization.

12012111121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12012111121 its reverse (12111121021), we get a palindrome (24123232142).

The spelling of 12012111121 in words is "twelve billion, twelve million, one hundred eleven thousand, one hundred twenty-one".