199321 has 2 divisors, whose sum is σ = 199322. Its totient is φ = 199320.

The previous prime is 199313. The next prime is 199337. The reversal of 199321 is 123991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198025 + 1296 = 445^2 + 36^2 .

It is a cyclic number.

It is not a de Polignac number, because 199321 - 2³ = 199313 is a prime.

It is a super-2 number, since 2×199321² = 79457722082, which contains 22 as substring.

199321 is a lucky number.

It is a plaindrome in base 9.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (199021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99660 + 99661.

It is an arithmetic number, because the mean of its divisors is an integer number (99661).

2¹⁹⁹³²¹ is an apocalyptic number.

It is an amenable number.

199321 is a deficient number, since it is larger than the sum of its proper divisors (1).

199321 is an equidigital number, since it uses as much as digits as its factorization.

199321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 25.

The square root of 199321 is about 446.4538050011. The cubic root of 199321 is about 58.4140994605.

The spelling of 199321 in words is "one hundred ninety-nine thousand, three hundred twenty-one".