11055501221 has 4 divisors (see below), whose sum is σ = 11060112000. Its totient is φ = 11050890444.

The previous prime is 11055501203. The next prime is 11055501269. The reversal of 11055501221 is 12210555011.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12210555011 = 3659 ⋅3337129.

It is a cyclic number.

It is not a de Polignac number, because 11055501221 - 2⁶ = 11055501157 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 (11055504221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2301791 + ... + 2306588.

It is an arithmetic number, because the mean of its divisors is an integer number (2765028000).

Almost surely, 2^11055501221 is an apocalyptic number.

It is an amenable number.

11055501221 is a deficient number, since it is larger than the sum of its proper divisors (4610779).

11055501221 is an equidigital number, since it uses as much as digits as its factorization.

11055501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4610778.

The product of its (nonzero) digits is 500, while the sum is 23.

The spelling of 11055501221 in words is "eleven billion, fifty-five million, five hundred one thousand, two hundred twenty-one".