12321671 has 4 divisors (see below), whose sum is σ = 12970200. Its totient is φ = 11673144.

The previous prime is 12321653. The next prime is 12321679. The reversal of 12321671 is 17612321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12321671 - 2¹⁰ = 12320647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 324236 + ... + 324273.

It is an arithmetic number, because the mean of its divisors is an integer number (3242550).

Almost surely, 2^12321671 is an apocalyptic number.

12321671 is a deficient number, since it is larger than the sum of its proper divisors (648529).

12321671 is an equidigital number, since it uses as much as digits as its factorization.

12321671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648528.

The product of its digits is 504, while the sum is 23.

The square root of 12321671 is about 3510.2237820401. The cubic root of 12321671 is about 230.9705115310.

Adding to 12321671 its reverse (17612321), we get a palindrome (29933992).

The spelling of 12321671 in words is "twelve million, three hundred twenty-one thousand, six hundred seventy-one".