12155432123 has 4 divisors (see below), whose sum is σ = 12870457560. Its totient is φ = 11440406688.

The previous prime is 12155432117. The next prime is 12155432183. The reversal of 12155432123 is 32123455121.

12155432123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32123455121 = 29 ⋅1107705349.

It is a cyclic number.

It is not a de Polignac number, because 12155432123 - 2⁶ = 12155432059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12155432183) 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 3 ways as a sum of consecutive naturals, for example, 357512693 + ... + 357512726.

It is an arithmetic number, because the mean of its divisors is an integer number (3217614390).

Almost surely, 2^12155432123 is an apocalyptic number.

12155432123 is a deficient number, since it is larger than the sum of its proper divisors (715025437).

12155432123 is an equidigital number, since it uses as much as digits as its factorization.

12155432123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715025436.

The product of its digits is 7200, while the sum is 29.

Adding to 12155432123 its reverse (32123455121), we get a palindrome (44278887244).

The spelling of 12155432123 in words is "twelve billion, one hundred fifty-five million, four hundred thirty-two thousand, one hundred twenty-three".