121111200017111 has 2 divisors, whose sum is σ = 121111200017112. Its totient is φ = 121111200017110.

The previous prime is 121111200017063. The next prime is 121111200017141. The reversal of 121111200017111 is 111710002111121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121111200017111 - 2¹⁸ = 121111199754967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111200017141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555600008555 + 60555600008556.

It is an arithmetic number, because the mean of its divisors is an integer number (60555600008556).

Almost surely, 2^{121111200017111} is an apocalyptic number.

121111200017111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111200017111 is an equidigital number, since it uses as much as digits as its factorization.

121111200017111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 20.

Adding to 121111200017111 its reverse (111710002111121), we get a palindrome (232821202128232).

The spelling of 121111200017111 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred million, seventeen thousand, one hundred eleven".