3221431321 has 2 divisors, whose sum is σ = 3221431322. Its totient is φ = 3221431320.

The previous prime is 3221431261. The next prime is 3221431363. The reversal of 3221431321 is 1231341223.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2250174096 + 971257225 = 47436^2 + 31165^2 .

It is a cyclic number.

It is not a de Polignac number, because 3221431321 - 2¹⁵ = 3221398553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3221431292 and 3221431301.

It is not a weakly prime, because it can be changed into another prime (3221431391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610715660 + 1610715661.

It is an arithmetic number, because the mean of its divisors is an integer number (1610715661).

Almost surely, 2^3221431321 is an apocalyptic number.

It is an amenable number.

3221431321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221431321 is an equidigital number, since it uses as much as digits as its factorization.

3221431321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 3221431321 is about 56757.6542943769. The cubic root of 3221431321 is about 1476.8950184582.

Adding to 3221431321 its reverse (1231341223), we get a palindrome (4452772544).

The spelling of 3221431321 in words is "three billion, two hundred twenty-one million, four hundred thirty-one thousand, three hundred twenty-one".