12129112455 has 16 divisors (see below), whose sum is σ = 19640396160. Its totient is φ = 6390921248.

The previous prime is 12129112447. The next prime is 12129112477. The reversal of 12129112455 is 55421192121.

It is a cyclic number.

It is not a de Polignac number, because 12129112455 - 2³ = 12129112447 is a prime.

It is a super-2 number, since 2×12129112455² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4869885 + ... + 4872374.

It is an arithmetic number, because the mean of its divisors is an integer number (1227524760).

Almost surely, 2^12129112455 is an apocalyptic number.

12129112455 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12129112455 is a deficient number, since it is larger than the sum of its proper divisors (7511283705).

12129112455 is an equidigital number, since it uses as much as digits as its factorization.

12129112455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9742350.

The product of its digits is 7200, while the sum is 33.

The spelling of 12129112455 in words is "twelve billion, one hundred twenty-nine million, one hundred twelve thousand, four hundred fifty-five".