111011212121291 has 2 divisors, whose sum is σ = 111011212121292. Its totient is φ = 111011212121290.

The previous prime is 111011212121209. The next prime is 111011212121309. The reversal of 111011212121291 is 192121212110111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111011212121291 - 2³⁴ = 110994032252107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111011212121291.

It is not a weakly prime, because it can be changed into another prime (111011212121791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505606060645 + 55505606060646.

It is an arithmetic number, because the mean of its divisors is an integer number (55505606060646).

Almost surely, 2^{111011212121291} is an apocalyptic number.

111011212121291 is a deficient number, since it is larger than the sum of its proper divisors (1).

111011212121291 is an equidigital number, since it uses as much as digits as its factorization.

111011212121291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 26.

The spelling of 111011212121291 in words is "one hundred eleven trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred ninety-one".