320320521 has 8 divisors (see below), whose sum is σ = 474548960. Its totient is φ = 213546996.

The previous prime is 320320513. The next prime is 320320537. The reversal of 320320521 is 125023023.

320320521 is a `hidden beast` number, since 320 + 320 + 5 + 21 = 666.

It is not a de Polignac number, because 320320521 - 2³ = 320320513 is a prime.

It is a super-2 number, since 2×320320521² = 205210472347422882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320320494 and 320320503.

It is not an unprimeable number, because it can be changed into a prime (320325521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5931835 + ... + 5931888.

It is an arithmetic number, because the mean of its divisors is an integer number (59318620).

Almost surely, 2^320320521 is an apocalyptic number.

It is an amenable number.

320320521 is a deficient number, since it is larger than the sum of its proper divisors (154228439).

320320521 is a wasteful number, since it uses less digits than its factorization.

320320521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11863732 (or 11863726 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 320320521 is about 17897.5004120687. The cubic root of 320320521 is about 684.2186704666.

Adding to 320320521 its reverse (125023023), we get a palindrome (445343544).

The spelling of 320320521 in words is "three hundred twenty million, three hundred twenty thousand, five hundred twenty-one".