102112011021991 has 2 divisors, whose sum is σ = 102112011021992. Its totient is φ = 102112011021990.

The previous prime is 102112011021961. The next prime is 102112011022003. The reversal of 102112011021991 is 199120110211201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102112011021991 - 2⁵ = 102112011021959 is a prime.

It is a super-2 number, since 2×102112011021991² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102112011021961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51056005510995 + 51056005510996.

It is an arithmetic number, because the mean of its divisors is an integer number (51056005510996).

Almost surely, 2^{102112011021991} is an apocalyptic number.

102112011021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102112011021991 is an equidigital number, since it uses as much as digits as its factorization.

102112011021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 102112011021991 in words is "one hundred two trillion, one hundred twelve billion, eleven million, twenty-one thousand, nine hundred ninety-one".