11557711021 has 4 divisors (see below), whose sum is σ = 11561155200. Its totient is φ = 11554266844.

The previous prime is 11557710977. The next prime is 11557711043. The reversal of 11557711021 is 12011775511.

11557711021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11557711021 - 2⁹ = 11557710509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11557711621) 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 in 3 ways as a sum of consecutive naturals, for example, 1717051 + ... + 1723768.

It is an arithmetic number, because the mean of its divisors is an integer number (2890288800).

Almost surely, 2^11557711021 is an apocalyptic number.

It is an amenable number.

11557711021 is a deficient number, since it is larger than the sum of its proper divisors (3444179).

11557711021 is an equidigital number, since it uses as much as digits as its factorization.

11557711021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444178.

The product of its (nonzero) digits is 2450, while the sum is 31.

The spelling of 11557711021 in words is "eleven billion, five hundred fifty-seven million, seven hundred eleven thousand, twenty-one".