12281321 has 4 divisors (see below), whose sum is σ = 13226052. Its totient is φ = 11336592.

The previous prime is 12281317. The next prime is 12281323. The reversal of 12281321 is 12318221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5125696 + 7155625 = 2264^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 12281321 - 2² = 12281317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12281293 and 12281302.

It is not an unprimeable number, because it can be changed into a prime (12281323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472346 + ... + 472371.

It is an arithmetic number, because the mean of its divisors is an integer number (3306513).

Almost surely, 2^12281321 is an apocalyptic number.

It is an amenable number.

12281321 is a deficient number, since it is larger than the sum of its proper divisors (944731).

12281321 is an equidigital number, since it uses as much as digits as its factorization.

12281321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944730.

The product of its digits is 192, while the sum is 20.

The square root of 12281321 is about 3504.4715721489. The cubic root of 12281321 is about 230.7181147098.

Adding to 12281321 its reverse (12318221), we get a palindrome (24599542).

The spelling of 12281321 in words is "twelve million, two hundred eighty-one thousand, three hundred twenty-one".