183221 has 4 divisors (see below), whose sum is σ = 186732. Its totient is φ = 179712.

The previous prime is 183203. The next prime is 183247. The reversal of 183221 is 122381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122381 = 7 ⋅17483.

It can be written as a sum of positive squares in 2 ways, for example, as 52900 + 130321 = 230^2 + 361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-183221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 183221.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 183221.

It is not an unprimeable number, because it can be changed into a prime (180221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1676 + ... + 1781.

It is an arithmetic number, because the mean of its divisors is an integer number (46683).

2¹⁸³²²¹ is an apocalyptic number.

It is an amenable number.

183221 is a deficient number, since it is larger than the sum of its proper divisors (3511).

183221 is an equidigital number, since it uses as much as digits as its factorization.

183221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510.

The product of its digits is 96, while the sum is 17.

The square root of 183221 is about 428.0432221166. The cubic root of 183221 is about 56.7969589392.

It can be divided in two parts, 183 and 221, that added together give a palindrome (404).

The spelling of 183221 in words is "one hundred eighty-three thousand, two hundred twenty-one".