11111073916721 has 2 divisors, whose sum is σ = 11111073916722. Its totient is φ = 11111073916720.

The previous prime is 11111073916699. The next prime is 11111073916853. The reversal of 11111073916721 is 12761937011111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11038341760000 + 72732156721 = 3322400^2 + 269689^2 .

It is an emirp because it is prime and its reverse (12761937011111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111073916721 - 2³⁸ = 10836196009777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (11111073916121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555536958360 + 5555536958361.

It is an arithmetic number, because the mean of its divisors is an integer number (5555536958361).

Almost surely, 2^{11111073916721} is an apocalyptic number.

It is an amenable number.

11111073916721 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111073916721 is an equidigital number, since it uses as much as digits as its factorization.

11111073916721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 41.

The spelling of 11111073916721 in words is "eleven trillion, one hundred eleven billion, seventy-three million, nine hundred sixteen thousand, seven hundred twenty-one".