13555121112 has 96 divisors (see below), whose sum is σ = 39885955200. Its totient is φ = 4133864448.

The previous prime is 13555121077. The next prime is 13555121137. The reversal of 13555121112 is 21112155531.

It is a happy number.

13555121112 is a `hidden beast` number, since 1 + 35 + 5 + 512 + 1 + 112 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41689 + ... + 169847.

It is an arithmetic number, because the mean of its divisors is an integer number (415478700).

Almost surely, 2^13555121112 is an apocalyptic number.

13555121112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13555121112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19942977600).

13555121112 is an abundant number, since it is smaller than the sum of its proper divisors (26330834088).

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

13555121112 is a wasteful number, since it uses less digits than its factorization.

13555121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128297 (or 128290 counting only the distinct ones).

The product of its digits is 1500, while the sum is 27.

Adding to 13555121112 its reverse (21112155531), we get a palindrome (34667276643).

The spelling of 13555121112 in words is "thirteen billion, five hundred fifty-five million, one hundred twenty-one thousand, one hundred twelve".