11056321021 has 16 divisors (see below), whose sum is σ = 11683828800. Its totient is φ = 10447644928.

The previous prime is 11056321013. The next prime is 11056321051. The reversal of 11056321021 is 12012365011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11056321021 - 2³ = 11056321013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11056320983 and 11056321001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11056321051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236085 + ... + 279013.

It is an arithmetic number, because the mean of its divisors is an integer number (730239300).

Almost surely, 2^11056321021 is an apocalyptic number.

It is an amenable number.

11056321021 is a deficient number, since it is larger than the sum of its proper divisors (627507779).

11056321021 is a wasteful number, since it uses less digits than its factorization.

11056321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43148.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 11056321021 its reverse (12012365011), we get a palindrome (23068686032).

The spelling of 11056321021 in words is "eleven billion, fifty-six million, three hundred twenty-one thousand, twenty-one".