221170 has 16 divisors (see below), whose sum is σ = 421848. Its totient is φ = 83200.

The previous prime is 221159. The next prime is 221171. The reversal of 221170 is 71122.

It can be written as a sum of positive squares in 4 ways, for example, as 131769 + 89401 = 363^2 + 299^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221170.

It is not an unprimeable number, because it can be changed into a prime (221171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 481 + ... + 820.

2²²¹¹⁷⁰ is an apocalyptic number.

221170 is a deficient number, since it is larger than the sum of its proper divisors (200678).

221170 is a wasteful number, since it uses less digits than its factorization.

221170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325.

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

The square root of 221170 is about 470.2871463266. The cubic root of 221170 is about 60.4749344063.

Adding to 221170 its reverse (71122), we get a palindrome (292292).

The spelling of 221170 in words is "two hundred twenty-one thousand, one hundred seventy", and thus it is an iban number.