121111101212111 has 2 divisors, whose sum is σ = 121111101212112. Its totient is φ = 121111101212110.

The previous prime is 121111101212071. The next prime is 121111101212177. The reversal of 121111101212111 is 111212101111121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (111212101111121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121111101212111 - 2¹⁴ = 121111101195727 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121111101212111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111101212191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555550606055 + 60555550606056.

It is an arithmetic number, because the mean of its divisors is an integer number (60555550606056).

Almost surely, 2^{121111101212111} is an apocalyptic number.

121111101212111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111101212111 is an equidigital number, since it uses as much as digits as its factorization.

121111101212111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 121111101212111 its reverse (111212101111121), we get a palindrome (232323202323232).

The spelling of 121111101212111 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred one million, two hundred twelve thousand, one hundred eleven".