11121105555 has 48 divisors (see below), whose sum is σ = 23189886720. Its totient is φ = 4816355904.

The previous prime is 11121105547. The next prime is 11121105587. The reversal of 11121105555 is 55550112111.

It is a happy number.

11121105555 is a `hidden beast` number, since 1 + 1 + 1 + 2 + 1 + 105 + 555 = 666.

It is not a de Polignac number, because 11121105555 - 2³ = 11121105547 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 923097 + ... + 935066.

It is an arithmetic number, because the mean of its divisors is an integer number (483122640).

Almost surely, 2^11121105555 is an apocalyptic number.

11121105555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11121105555 is an abundant number, since it is smaller than the sum of its proper divisors (12068781165).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11121105555 is a wasteful number, since it uses less digits than its factorization.

11121105555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1858200 (or 1858197 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 27.

Adding to 11121105555 its reverse (55550112111), we get a palindrome (66671217666).

The spelling of 11121105555 in words is "eleven billion, one hundred twenty-one million, one hundred five thousand, five hundred fifty-five".