12403321 has 12 divisors (see below), whose sum is σ = 14497380. Its totient is φ = 10580640.

The previous prime is 12403309. The next prime is 12403351. The reversal of 12403321 is 12330421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3759721 + 8643600 = 1939^2 + 2940^2 .

It is not a de Polignac number, because 12403321 - 2²³ = 4014713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12403295 and 12403304.

It is not an unprimeable number, because it can be changed into a prime (12403301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12711 + ... + 13651.

It is an arithmetic number, because the mean of its divisors is an integer number (1208115).

Almost surely, 2^12403321 is an apocalyptic number.

It is an amenable number.

12403321 is a deficient number, since it is larger than the sum of its proper divisors (2094059).

12403321 is an equidigital number, since it uses as much as digits as its factorization.

12403321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 12403321 is about 3521.8348910760. The cubic root of 12403321 is about 231.4795669153.

Adding to 12403321 its reverse (12330421), we get a palindrome (24733742).

Subtracting from 12403321 its reverse (12330421), we obtain a square (72900 = 270²).

The spelling of 12403321 in words is "twelve million, four hundred three thousand, three hundred twenty-one".