102101022021991 has 2 divisors, whose sum is σ = 102101022021992. Its totient is φ = 102101022021990.

The previous prime is 102101022021871. The next prime is 102101022022099. The reversal of 102101022021991 is 199120220101201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102101022021991 - 2¹⁷ = 102101021890919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102101022021391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51050511010995 + 51050511010996.

It is an arithmetic number, because the mean of its divisors is an integer number (51050511010996).

Almost surely, 2^{102101022021991} is an apocalyptic number.

102101022021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102101022021991 is an equidigital number, since it uses as much as digits as its factorization.

102101022021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 102101022021991 in words is "one hundred two trillion, one hundred one billion, twenty-two million, twenty-one thousand, nine hundred ninety-one".