320401021 has 8 divisors (see below), whose sum is σ = 327510144. Its totient is φ = 313304160.

The previous prime is 320401013. The next prime is 320401033. The reversal of 320401021 is 120104023.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 320401021 - 2³ = 320401013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320400992 and 320401010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320401051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67306 + ... + 71908.

It is an arithmetic number, because the mean of its divisors is an integer number (40938768).

Almost surely, 2^320401021 is an apocalyptic number.

It is an amenable number.

320401021 is a deficient number, since it is larger than the sum of its proper divisors (7109123).

320401021 is a wasteful number, since it uses less digits than its factorization.

320401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 320401021 is about 17899.7491881870. The cubic root of 320401021 is about 684.2759828418.

Adding to 320401021 its reverse (120104023), we get a palindrome (440505044).

The spelling of 320401021 in words is "three hundred twenty million, four hundred one thousand, twenty-one".