221323 has 8 divisors (see below), whose sum is σ = 240192. Its totient is φ = 203136.

The previous prime is 221317. The next prime is 221327. The reversal of 221323 is 323122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221323 - 2⁹ = 220811 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 661 + ... + 937.

It is an arithmetic number, because the mean of its divisors is an integer number (30024).

2²²¹³²³ is an apocalyptic number.

221323 is a deficient number, since it is larger than the sum of its proper divisors (18869).

221323 is a wasteful number, since it uses less digits than its factorization.

221323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341.

The product of its digits is 72, while the sum is 13.

The square root of 221323 is about 470.4497847805. The cubic root of 221323 is about 60.4888762191.

Adding to 221323 its reverse (323122), we get a palindrome (544445).

The spelling of 221323 in words is "two hundred twenty-one thousand, three hundred twenty-three", and thus it is an iban number.