221273 has 4 divisors (see below), whose sum is σ = 238308. Its totient is φ = 204240.

The previous prime is 221261. The next prime is 221281. The reversal of 221273 is 372122.

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 135424 + 85849 = 368^2 + 293^2 .

It is a cyclic number.

It is not a de Polignac number, because 221273 - 2⁶ = 221209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221203) 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, 8498 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (59577).

2²²¹²⁷³ is an apocalyptic number.

It is an amenable number.

221273 is a deficient number, since it is larger than the sum of its proper divisors (17035).

221273 is a wasteful number, since it uses less digits than its factorization.

221273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17034.

The product of its digits is 168, while the sum is 17.

The square root of 221273 is about 470.3966411445. The cubic root of 221273 is about 60.4843207781.

Adding to 221273 its reverse (372122), we get a palindrome (593395).

It can be divided in two parts, 221 and 273, that added together give a palindrome (494).

The spelling of 221273 in words is "two hundred twenty-one thousand, two hundred seventy-three", and thus it is an iban number.