320424021 has 12 divisors (see below), whose sum is σ = 463697260. Its totient is φ = 213217920.

The previous prime is 320424011. The next prime is 320424031. The reversal of 320424021 is 120424023.

It is an interprime number because it is at equal distance from previous prime (320424011) and next prime (320424031).

It can be written as a sum of positive squares in 2 ways, for example, as 231800625 + 88623396 = 15225^2 + 9414^2 .

It is not a de Polignac number, because 320424021 - 2¹⁹ = 319899733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320423985 and 320424003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320424001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28036 + ... + 37773.

Almost surely, 2^320424021 is an apocalyptic number.

It is an amenable number.

320424021 is a deficient number, since it is larger than the sum of its proper divisors (143273239).

320424021 is a wasteful number, since it uses less digits than its factorization.

320424021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66356 (or 66353 counting only the distinct ones).

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

The square root of 320424021 is about 17900.3916437602. The cubic root of 320424021 is about 684.2923560429.

Adding to 320424021 its reverse (120424023), we get a palindrome (440848044).

It can be divided in two parts, 32042 and 4021, that added together give a palindrome (36063).

The spelling of 320424021 in words is "three hundred twenty million, four hundred twenty-four thousand, twenty-one".