673217321 has 12 divisors (see below), whose sum is σ = 785218320. Its totient is φ = 575505000.

The previous prime is 673217309. The next prime is 673217327. The reversal of 673217321 is 123712376.

It is not a de Polignac number, because 673217321 - 2¹⁴ = 673200937 is a prime.

It is a super-2 number, since 2×673217321² = 906443122588834082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673217327) 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, 446 + ... + 36696.

It is an arithmetic number, because the mean of its divisors is an integer number (65434860).

Almost surely, 2^673217321 is an apocalyptic number.

It is an amenable number.

673217321 is a deficient number, since it is larger than the sum of its proper divisors (112000999).

673217321 is a wasteful number, since it uses less digits than its factorization.

673217321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36644 (or 36637 counting only the distinct ones).

The product of its digits is 10584, while the sum is 32.

The square root of 673217321 is about 25946.4317585290. The cubic root of 673217321 is about 876.4324058217.

Adding to 673217321 its reverse (123712376), we get a palindrome (796929697).

The spelling of 673217321 in words is "six hundred seventy-three million, two hundred seventeen thousand, three hundred twenty-one".