11181265621 has 2 divisors, whose sum is σ = 11181265622. Its totient is φ = 11181265620.

The previous prime is 11181265603. The next prime is 11181265633. The reversal of 11181265621 is 12656218111.

11181265621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6041952900 + 5139312721 = 77730^2 + 71689^2 .

It is an emirp because it is prime and its reverse (12656218111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11181265621 - 2¹⁹ = 11180741333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11181268621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5590632810 + 5590632811.

It is an arithmetic number, because the mean of its divisors is an integer number (5590632811).

Almost surely, 2^11181265621 is an apocalyptic number.

It is an amenable number.

11181265621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11181265621 is an equidigital number, since it uses as much as digits as its factorization.

11181265621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 34.

The spelling of 11181265621 in words is "eleven billion, one hundred eighty-one million, two hundred sixty-five thousand, six hundred twenty-one".