6623321 has 2 divisors, whose sum is σ = 6623322. Its totient is φ = 6623320.

The previous prime is 6623311. The next prime is 6623327. The reversal of 6623321 is 1233266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6250000 + 373321 = 2500^2 + 611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6623321 is a prime.

It is not a weakly prime, because it can be changed into another prime (6623327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3311660 + 3311661.

It is an arithmetic number, because the mean of its divisors is an integer number (3311661).

Almost surely, 2^6623321 is an apocalyptic number.

It is an amenable number.

6623321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6623321 is an equidigital number, since it uses as much as digits as its factorization.

6623321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 23.

The square root of 6623321 is about 2573.5813567867. The cubic root of 6623321 is about 187.7984201975.

Adding to 6623321 its reverse (1233266), we get a palindrome (7856587).

The spelling of 6623321 in words is "six million, six hundred twenty-three thousand, three hundred twenty-one".