121111200212111 has 2 divisors, whose sum is σ = 121111200212112. Its totient is φ = 121111200212110.

The previous prime is 121111200212083. The next prime is 121111200212129. The reversal of 121111200212111 is 111212002111121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121111200212111 - 2³⁰ = 121110126470287 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121111200212111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111200212411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555600106055 + 60555600106056.

It is an arithmetic number, because the mean of its divisors is an integer number (60555600106056).

Almost surely, 2^{121111200212111} is an apocalyptic number.

121111200212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111200212111 is an equidigital number, since it uses as much as digits as its factorization.

121111200212111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 121111200212111 its reverse (111212002111121), we get a palindrome (232323202323232).

The spelling of 121111200212111 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred million, two hundred twelve thousand, one hundred eleven".