102120210099991 has 2 divisors, whose sum is σ = 102120210099992. Its totient is φ = 102120210099990.

The previous prime is 102120210099953. The next prime is 102120210100031. The reversal of 102120210099991 is 199990012021201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102120210099991 - 2¹⁵ = 102120210067223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102120210099091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060105049995 + 51060105049996.

It is an arithmetic number, because the mean of its divisors is an integer number (51060105049996).

Almost surely, 2^{102120210099991} is an apocalyptic number.

102120210099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120210099991 is an equidigital number, since it uses as much as digits as its factorization.

102120210099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 46.

The spelling of 102120210099991 in words is "one hundred two trillion, one hundred twenty billion, two hundred ten million, ninety-nine thousand, nine hundred ninety-one".