320326421 has 2 divisors, whose sum is σ = 320326422. Its totient is φ = 320326420.

The previous prime is 320326403. The next prime is 320326423. The reversal of 320326421 is 124623023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224580196 + 95746225 = 14986^2 + 9785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320326421 is a prime.

Together with 320326423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320326423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160163210 + 160163211.

It is an arithmetic number, because the mean of its divisors is an integer number (160163211).

Almost surely, 2^320326421 is an apocalyptic number.

It is an amenable number.

320326421 is a deficient number, since it is larger than the sum of its proper divisors (1).

320326421 is an equidigital number, since it uses as much as digits as its factorization.

320326421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 320326421 is about 17897.6652387958. The cubic root of 320326421 is about 684.2228713270. Note that the first 3 decimals are identical.

Adding to 320326421 its reverse (124623023), we get a palindrome (444949444).

The spelling of 320326421 in words is "three hundred twenty million, three hundred twenty-six thousand, four hundred twenty-one".