12315243421 has 8 divisors (see below), whose sum is σ = 13274675064. Its totient is φ = 11357541120.

The previous prime is 12315243407. The next prime is 12315243449. The reversal of 12315243421 is 12434251321.

It can be written as a sum of positive squares in 4 ways, for example, as 1347917796 + 10967325625 = 36714^2 + 104725^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 12315243421 - 2⁵ = 12315243389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12315243421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12315243121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 417520 + ... + 446041.

It is an arithmetic number, because the mean of its divisors is an integer number (1659334383).

Almost surely, 2^12315243421 is an apocalyptic number.

It is an amenable number.

12315243421 is a deficient number, since it is larger than the sum of its proper divisors (959431643).

12315243421 is a wasteful number, since it uses less digits than its factorization.

12315243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864671.

The product of its digits is 5760, while the sum is 28.

Adding to 12315243421 its reverse (12434251321), we get a palindrome (24749494742).

The spelling of 12315243421 in words is "twelve billion, three hundred fifteen million, two hundred forty-three thousand, four hundred twenty-one".