12517321 has 8 divisors (see below), whose sum is σ = 13284864. Its totient is φ = 11753280.

The previous prime is 12517319. The next prime is 12517339. The reversal of 12517321 is 12371521.

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 12517321 - 2¹ = 12517319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12517292 and 12517301.

It is not an unprimeable number, because it can be changed into a prime (12517301) 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, 12136 + ... + 13126.

It is an arithmetic number, because the mean of its divisors is an integer number (1660608).

Almost surely, 2^12517321 is an apocalyptic number.

It is an amenable number.

12517321 is a deficient number, since it is larger than the sum of its proper divisors (767543).

12517321 is an equidigital number, since it uses as much as digits as its factorization.

12517321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1751.

The product of its digits is 420, while the sum is 22.

The square root of 12517321 is about 3537.9826172552. The cubic root of 12517321 is about 232.1865881525.

Adding to 12517321 its reverse (12371521), we get a palindrome (24888842).

The spelling of 12517321 in words is "twelve million, five hundred seventeen thousand, three hundred twenty-one".