221017 has 4 divisors (see below), whose sum is σ = 234036. Its totient is φ = 208000.

The previous prime is 220973. The next prime is 221021. The reversal of 221017 is 710122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69696 + 151321 = 264^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 221017 - 2⁷ = 220889 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

221017 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 220988 and 221006.

It is not an unprimeable number, because it can be changed into a prime (221047) 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, 6484 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (58509).

2²²¹⁰¹⁷ is an apocalyptic number.

It is an amenable number.

221017 is a deficient number, since it is larger than the sum of its proper divisors (13019).

221017 is a wasteful number, since it uses less digits than its factorization.

221017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13018.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 221017 is about 470.1244516083. The cubic root of 221017 is about 60.4609861623.

Adding to 221017 its reverse (710122), we get a palindrome (931139).

The spelling of 221017 in words is "two hundred twenty-one thousand, seventeen", and thus it is an iban number.