198321 has 4 divisors (see below), whose sum is σ = 264432. Its totient is φ = 132212.

The previous prime is 198313. The next prime is 198323. The reversal of 198321 is 123891.

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 198321 - 2³ = 198313 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 198291 and 198300.

It is not an unprimeable number, because it can be changed into a prime (198323) 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, 33051 + ... + 33056.

It is an arithmetic number, because the mean of its divisors is an integer number (66108).

2¹⁹⁸³²¹ is an apocalyptic number.

It is an amenable number.

198321 is a deficient number, since it is larger than the sum of its proper divisors (66111).

198321 is an equidigital number, since it uses as much as digits as its factorization.

198321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66110.

The product of its digits is 432, while the sum is 24.

The square root of 198321 is about 445.3324600790. The cubic root of 198321 is about 58.3162471500.

The spelling of 198321 in words is "one hundred ninety-eight thousand, three hundred twenty-one".