321673217 has 4 divisors (see below), whose sum is σ = 328517376. Its totient is φ = 314829060.

The previous prime is 321673199. The next prime is 321673237. The reversal of 321673217 is 712376123.

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 not a de Polignac number, because 321673217 - 2²⁴ = 304896001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (321673237) 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, 3422009 + ... + 3422102.

It is an arithmetic number, because the mean of its divisors is an integer number (82129344).

Almost surely, 2^321673217 is an apocalyptic number.

It is an amenable number.

321673217 is a deficient number, since it is larger than the sum of its proper divisors (6844159).

321673217 is an equidigital number, since it uses as much as digits as its factorization.

321673217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6844158.

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

The square root of 321673217 is about 17935.2506812701. The cubic root of 321673217 is about 685.1804571890.

The spelling of 321673217 in words is "three hundred twenty-one million, six hundred seventy-three thousand, two hundred seventeen".