12318421 has 8 divisors (see below), whose sum is σ = 13124160. Its totient is φ = 11521728.

The previous prime is 12318413. The next prime is 12318431. The reversal of 12318421 is 12481321.

It is a happy number.

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 12318421 - 2³ = 12318413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12318392 and 12318401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 670 + ... + 5008.

It is an arithmetic number, because the mean of its divisors is an integer number (1640520).

Almost surely, 2^12318421 is an apocalyptic number.

It is an amenable number.

12318421 is a deficient number, since it is larger than the sum of its proper divisors (805739).

12318421 is a wasteful number, since it uses less digits than its factorization.

12318421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

The product of its digits is 384, while the sum is 22.

The square root of 12318421 is about 3509.7608180615. The cubic root of 12318421 is about 230.9502025926.

Adding to 12318421 its reverse (12481321), we get a palindrome (24799742).

The spelling of 12318421 in words is "twelve million, three hundred eighteen thousand, four hundred twenty-one".