320204421 has 20 divisors (see below), whose sum is σ = 478952364. Its totient is φ = 213192000.

The previous prime is 320204411. The next prime is 320204447. The reversal of 320204421 is 124402023.

It can be written as a sum of positive squares in 2 ways, for example, as 94303521 + 225900900 = 9711^2 + 15030^2 .

It is not a de Polignac number, because 320204421 - 2⁵ = 320204389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 320204394 and 320204403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320204411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 74121 + ... + 78321.

Almost surely, 2^320204421 is an apocalyptic number.

It is an amenable number.

320204421 is a deficient number, since it is larger than the sum of its proper divisors (158747943).

320204421 is an equidigital number, since it uses as much as digits as its factorization.

320204421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5154 (or 5145 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 320204421 is about 17894.2566484333. The cubic root of 320204421 is about 684.1359955814.

Adding to 320204421 its reverse (124402023), we get a palindrome (444606444).

The spelling of 320204421 in words is "three hundred twenty million, two hundred four thousand, four hundred twenty-one".