12315621233418 has 32 divisors (see below), whose sum is σ = 25205407761600. Its totient is φ = 4009523056896.

The previous prime is 12315621233407. The next prime is 12315621233483. The reversal of 12315621233418 is 81433212651321.

It is a self number, because there is not a number n which added to its sum of digits gives 12315621233418.

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, 3603298 + ... + 6133106.

It is an arithmetic number, because the mean of its divisors is an integer number (787668992550).

Almost surely, 2^{12315621233418} is an apocalyptic number.

12315621233418 is an abundant number, since it is smaller than the sum of its proper divisors (12889786528182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12315621233418 is a wasteful number, since it uses less digits than its factorization.

12315621233418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548726.

The product of its digits is 207360, while the sum is 42.

Adding to 12315621233418 its reverse (81433212651321), we get a palindrome (93748833884739).

The spelling of 12315621233418 in words is "twelve trillion, three hundred fifteen billion, six hundred twenty-one million, two hundred thirty-three thousand, four hundred eighteen".