11170897921 has 2 divisors, whose sum is σ = 11170897922. Its totient is φ = 11170897920.

The previous prime is 11170897891. The next prime is 11170897939. The reversal of 11170897921 is 12979807111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10285002225 + 885895696 = 101415^2 + 29764^2 .

It is an emirp because it is prime and its reverse (12979807111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11170897921 is a prime.

It is a super-2 number, since 2×11170897921² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11170897951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5585448960 + 5585448961.

It is an arithmetic number, because the mean of its divisors is an integer number (5585448961).

Almost surely, 2^11170897921 is an apocalyptic number.

It is an amenable number.

11170897921 is a deficient number, since it is larger than the sum of its proper divisors (1).

11170897921 is an equidigital number, since it uses as much as digits as its factorization.

11170897921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 46.

The spelling of 11170897921 in words is "eleven billion, one hundred seventy million, eight hundred ninety-seven thousand, nine hundred twenty-one".