321001 has 4 divisors (see below), whose sum is σ = 332100. Its totient is φ = 309904.

The previous prime is 320953. The next prime is 321007. The reversal of 321001 is 100123.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100123 = 59 ⋅1697.

It can be written as a sum of positive squares in 2 ways, for example, as 90601 + 230400 = 301^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 321001 - 2¹⁷ = 189929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5506 + ... + 5563.

It is an arithmetic number, because the mean of its divisors is an integer number (83025).

2³²¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

321001 is a deficient number, since it is larger than the sum of its proper divisors (11099).

321001 is a wasteful number, since it uses less digits than its factorization.

321001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11098.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 321001 is about 566.5695014736. The cubic root of 321001 is about 68.4702838766.

Adding to 321001 its reverse (100123), we get a palindrome (421124).

The spelling of 321001 in words is "three hundred twenty-one thousand, one", and thus it is an iban number.