11256884021 has 4 divisors (see below), whose sum is σ = 11620009344. Its totient is φ = 10893758700.

The previous prime is 11256884017. The next prime is 11256884099. The reversal of 11256884021 is 12048865211.

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 11256884021 - 2² = 11256884017 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 (11256824021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181562615 + ... + 181562676.

It is an arithmetic number, because the mean of its divisors is an integer number (2905002336).

Almost surely, 2^11256884021 is an apocalyptic number.

It is an amenable number.

11256884021 is a deficient number, since it is larger than the sum of its proper divisors (363125323).

11256884021 is an equidigital number, since it uses as much as digits as its factorization.

11256884021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363125322.

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 11256884021 in words is "eleven billion, two hundred fifty-six million, eight hundred eighty-four thousand, twenty-one".