12123440055 has 24 divisors (see below), whose sum is σ = 21030216480. Its totient is φ = 6460833600.

The previous prime is 12123440039. The next prime is 12123440057. The reversal of 12123440055 is 55004432121.

12123440055 is a `hidden beast` number, since 1 + 21 + 234 + 400 + 5 + 5 = 666.

It is not a de Polignac number, because 12123440055 - 2⁴ = 12123440039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123440057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44995 + ... + 162084.

It is an arithmetic number, because the mean of its divisors is an integer number (876259020).

Almost surely, 2^12123440055 is an apocalyptic number.

12123440055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12123440055 is a deficient number, since it is larger than the sum of its proper divisors (8906776425).

12123440055 is a wasteful number, since it uses less digits than its factorization.

12123440055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208391 (or 208388 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 12123440055 its reverse (55004432121), we get a palindrome (67127872176).

The spelling of 12123440055 in words is "twelve billion, one hundred twenty-three million, four hundred forty thousand, fifty-five".