12117243538 has 8 divisors (see below), whose sum is σ = 18394851888. Its totient is φ = 5985626244.

The previous prime is 12117243533. The next prime is 12117243547. The reversal of 12117243538 is 83534271121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 12117243497 and 12117243506.

It is not an unprimeable number, because it can be changed into a prime (12117243533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36497556 + ... + 36497887.

It is an arithmetic number, because the mean of its divisors is an integer number (2299356486).

Almost surely, 2^12117243538 is an apocalyptic number.

12117243538 is a deficient number, since it is larger than the sum of its proper divisors (6277608350).

12117243538 is an equidigital number, since it uses as much as digits as its factorization.

12117243538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72995528.

The product of its digits is 40320, while the sum is 37.

The spelling of 12117243538 in words is "twelve billion, one hundred seventeen million, two hundred forty-three thousand, five hundred thirty-eight".