12123443145 has 72 divisors (see below), whose sum is σ = 22503676608. Its totient is φ = 5568361920.

The previous prime is 12123443071. The next prime is 12123443147. The reversal of 12123443145 is 54134432121.

It is not a de Polignac number, because 12123443145 - 2⁹ = 12123442633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12123443147) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 645964 + ... + 664466.

It is an arithmetic number, because the mean of its divisors is an integer number (312551064).

Almost surely, 2^12123443145 is an apocalyptic number.

12123443145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12123443145 is a deficient number, since it is larger than the sum of its proper divisors (10380233463).

12123443145 is a wasteful number, since it uses less digits than its factorization.

12123443145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18571 (or 18541 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

Adding to 12123443145 its reverse (54134432121), we get a palindrome (66257875266).

The spelling of 12123443145 in words is "twelve billion, one hundred twenty-three million, four hundred forty-three thousand, one hundred forty-five".