12121121210111 has 2 divisors, whose sum is σ = 12121121210112. Its totient is φ = 12121121210110.

The previous prime is 12121121210047. The next prime is 12121121210113. The reversal of 12121121210111 is 11101212112121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12121121210111 - 2⁶ = 12121121210047 is a prime.

Together with 12121121210113, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121121210111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121121210113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060560605055 + 6060560605056.

It is an arithmetic number, because the mean of its divisors is an integer number (6060560605056).

Almost surely, 2^{12121121210111} is an apocalyptic number.

12121121210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121121210111 is an equidigital number, since it uses as much as digits as its factorization.

12121121210111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 12121121210111 its reverse (11101212112121), we get a palindrome (23222333322232).

The spelling of 12121121210111 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-one million, two hundred ten thousand, one hundred eleven".