121111111022191 has 2 divisors, whose sum is σ = 121111111022192. Its totient is φ = 121111111022190.

The previous prime is 121111111022029. The next prime is 121111111022197. The reversal of 121111111022191 is 191220111111121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121111111022191 - 2¹¹ = 121111111020143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111111022197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555555511095 + 60555555511096.

It is an arithmetic number, because the mean of its divisors is an integer number (60555555511096).

Almost surely, 2^{121111111022191} is an apocalyptic number.

121111111022191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111111022191 is an equidigital number, since it uses as much as digits as its factorization.

121111111022191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 25.

The spelling of 121111111022191 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, twenty-two thousand, one hundred ninety-one".