321673 has 4 divisors (see below), whose sum is σ = 350928. Its totient is φ = 292420.

The previous prime is 321661. The next prime is 321679. The reversal of 321673 is 376123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321673 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14611 + ... + 14632.

It is an arithmetic number, because the mean of its divisors is an integer number (87732).

2³²¹⁶⁷³ is an apocalyptic number.

It is an amenable number.

321673 is a deficient number, since it is larger than the sum of its proper divisors (29255).

321673 is a wasteful number, since it uses less digits than its factorization.

321673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29254.

The product of its digits is 756, while the sum is 22.

The square root of 321673 is about 567.1622342857. The cubic root of 321673 is about 68.5180303115.

Adding to 321673 its reverse (376123), we get a palindrome (697796).

The spelling of 321673 in words is "three hundred twenty-one thousand, six hundred seventy-three".