320224921 has 2 divisors, whose sum is σ = 320224922. Its totient is φ = 320224920.

The previous prime is 320224909. The next prime is 320224963. The reversal of 320224921 is 129422023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224400400 + 95824521 = 14980^2 + 9789^2 .

It is a cyclic number.

It is not a de Polignac number, because 320224921 - 2²¹ = 318127769 is a prime.

It is not a weakly prime, because it can be changed into another prime (320224991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160112460 + 160112461.

It is an arithmetic number, because the mean of its divisors is an integer number (160112461).

Almost surely, 2^320224921 is an apocalyptic number.

It is an amenable number.

320224921 is a deficient number, since it is larger than the sum of its proper divisors (1).

320224921 is an equidigital number, since it uses as much as digits as its factorization.

320224921 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 25.

The square root of 320224921 is about 17894.8294487542. The cubic root of 320224921 is about 684.1505950973.

Adding to 320224921 its reverse (129422023), we get a palindrome (449646944).

The spelling of 320224921 in words is "three hundred twenty million, two hundred twenty-four thousand, nine hundred twenty-one".