11155013121 has 24 divisors (see below), whose sum is σ = 17594915040. Its totient is φ = 6266249472.

The previous prime is 11155013099. The next prime is 11155013137. The reversal of 11155013121 is 12131055111.

11155013121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11155013121 - 2¹⁹ = 11154488833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11155013321) 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 23 ways as a sum of consecutive naturals, for example, 634416 + ... + 651761.

It is an arithmetic number, because the mean of its divisors is an integer number (733121460).

Almost surely, 2^11155013121 is an apocalyptic number.

It is an amenable number.

11155013121 is a deficient number, since it is larger than the sum of its proper divisors (6439901919).

11155013121 is a wasteful number, since it uses less digits than its factorization.

11155013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286253 (or 1286246 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 21.

Adding to 11155013121 its reverse (12131055111), we get a palindrome (23286068232).

The spelling of 11155013121 in words is "eleven billion, one hundred fifty-five million, thirteen thousand, one hundred twenty-one".