11111001211097 has 2 divisors, whose sum is σ = 11111001211098. Its totient is φ = 11111001211096.

The previous prime is 11111001211087. The next prime is 11111001211153. The reversal of 11111001211097 is 79011210011111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10084759273801 + 1026241937296 = 3175651^2 + 1013036^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111001211097 - 2²⁸ = 11110732775641 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111001211087) 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, 5555500605548 + 5555500605549.

It is an arithmetic number, because the mean of its divisors is an integer number (5555500605549).

Almost surely, 2^{11111001211097} is an apocalyptic number.

It is an amenable number.

11111001211097 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111001211097 is an equidigital number, since it uses as much as digits as its factorization.

11111001211097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126, while the sum is 26.

The spelling of 11111001211097 in words is "eleven trillion, one hundred eleven billion, one million, two hundred eleven thousand, ninety-seven".