101211100209991 has 2 divisors, whose sum is σ = 101211100209992. Its totient is φ = 101211100209990.

The previous prime is 101211100209959. The next prime is 101211100210027. The reversal of 101211100209991 is 199902001112101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101211100209991 - 2⁵ = 101211100209959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101211100209991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101211100209091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605550104995 + 50605550104996.

It is an arithmetic number, because the mean of its divisors is an integer number (50605550104996).

Almost surely, 2^{101211100209991} is an apocalyptic number.

101211100209991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101211100209991 is an equidigital number, since it uses as much as digits as its factorization.

101211100209991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 37.

The spelling of 101211100209991 in words is "one hundred one trillion, two hundred eleven billion, one hundred million, two hundred nine thousand, nine hundred ninety-one".