100111010020991 has 2 divisors, whose sum is σ = 100111010020992. Its totient is φ = 100111010020990.

The previous prime is 100111010020927. The next prime is 100111010021051. The reversal of 100111010020991 is 199020010111001.

It is a strong prime.

It is an emirp because it is prime and its reverse (199020010111001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100111010020991 - 2⁶ = 100111010020927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 100111010020991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100111010020921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50055505010495 + 50055505010496.

It is an arithmetic number, because the mean of its divisors is an integer number (50055505010496).

Almost surely, 2^{100111010020991} is an apocalyptic number.

100111010020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100111010020991 is an equidigital number, since it uses as much as digits as its factorization.

100111010020991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 26.

Adding to 100111010020991 its reverse (199020010111001), we get a palindrome (299131020131992).

The spelling of 100111010020991 in words is "one hundred trillion, one hundred eleven billion, ten million, twenty thousand, nine hundred ninety-one".