102120111000991 has 2 divisors, whose sum is σ = 102120111000992. Its totient is φ = 102120111000990.

The previous prime is 102120111000989. The next prime is 102120111001001. The reversal of 102120111000991 is 199000111021201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102120111000991 - 2¹ = 102120111000989 is a prime.

Together with 102120111000989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102120111000091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060055500495 + 51060055500496.

It is an arithmetic number, because the mean of its divisors is an integer number (51060055500496).

Almost surely, 2^{102120111000991} is an apocalyptic number.

102120111000991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102120111000991 is an equidigital number, since it uses as much as digits as its factorization.

102120111000991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 102120111000991 in words is "one hundred two trillion, one hundred twenty billion, one hundred eleven million, nine hundred ninety-one", and thus it is an aban number.