12000000123 has 16 divisors (see below), whose sum is σ = 17802880800. Its totient is φ = 7988703840.

The previous prime is 12000000091. The next prime is 12000000139. The reversal of 12000000123 is 32100000021.

It is a happy number.

It is not a de Polignac number, because 12000000123 - 2⁵ = 12000000091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (12000000143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294288 + ... + 332573.

It is an arithmetic number, because the mean of its divisors is an integer number (1112680050).

Almost surely, 2^12000000123 is an apocalyptic number.

12000000123 is a deficient number, since it is larger than the sum of its proper divisors (5802880677).

12000000123 is an equidigital number, since it uses as much as digits as its factorization.

12000000123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627579 (or 627573 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 12000000123 its reverse (32100000021), we get a palindrome (44100000144).

The spelling of 12000000123 in words is "twelve billion, one hundred twenty-three", and thus it is an aban number.