102101111199991 has 2 divisors, whose sum is σ = 102101111199992. Its totient is φ = 102101111199990.

The previous prime is 102101111199979. The next prime is 102101111200027. The reversal of 102101111199991 is 199991111101201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102101111199991 - 2⁵ = 102101111199959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102101111199391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050555599995 + 51050555599996.

It is an arithmetic number, because the mean of its divisors is an integer number (51050555599996).

Almost surely, 2^{102101111199991} is an apocalyptic number.

102101111199991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102101111199991 is an equidigital number, since it uses as much as digits as its factorization.

102101111199991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 46.

The spelling of 102101111199991 in words is "one hundred two trillion, one hundred one billion, one hundred eleven million, one hundred ninety-nine thousand, nine hundred ninety-one".