220321 has 4 divisors (see below), whose sum is σ = 224532. Its totient is φ = 216112.

The previous prime is 220307. The next prime is 220327. The reversal of 220321 is 123022.

220321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123022 = 2 ⋅61511.

It can be written as a sum of positive squares in 2 ways, for example, as 130321 + 90000 = 361^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 220321 - 2⁹ = 219809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220298 and 220307.

It is not an unprimeable number, because it can be changed into a prime (220327) 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, 2026 + ... + 2131.

It is an arithmetic number, because the mean of its divisors is an integer number (56133).

2²²⁰³²¹ is an apocalyptic number.

It is an amenable number.

220321 is a deficient number, since it is larger than the sum of its proper divisors (4211).

220321 is an equidigital number, since it uses as much as digits as its factorization.

220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4210.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 220321 is about 469.3836384025. The cubic root of 220321 is about 60.3974539517.

Adding to 220321 its reverse (123022), we get a palindrome (343343).

The spelling of 220321 in words is "two hundred twenty thousand, three hundred twenty-one", and thus it is an iban number.