11055543121 has 6 divisors (see below), whose sum is σ = 12860529810. Its totient is φ = 9476179776.

The previous prime is 11055543089. The next prime is 11055543137. The reversal of 11055543121 is 12134555011.

11055543121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7779240000 + 3276303121 = 88200^2 + 57239^2 .

It is not a de Polignac number, because 11055543121 - 2⁵ = 11055543089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11055543121.

It is not an unprimeable number, because it can be changed into a prime (11055513121) 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 5 ways as a sum of consecutive naturals, for example, 112811616 + ... + 112811713.

It is an arithmetic number, because the mean of its divisors is an integer number (2143421635).

Almost surely, 2^11055543121 is an apocalyptic number.

It is an amenable number.

11055543121 is a deficient number, since it is larger than the sum of its proper divisors (1804986689).

11055543121 is an equidigital number, since it uses as much as digits as its factorization.

11055543121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225623343 (or 225623336 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 11055543121 in words is "eleven billion, fifty-five million, five hundred forty-three thousand, one hundred twenty-one".