221271 has 4 divisors (see below), whose sum is σ = 295032. Its totient is φ = 147512.

The previous prime is 221261. The next prime is 221281. The reversal of 221271 is 172122.

221271 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.

It is an interprime number because it is at equal distance from previous prime (221261) and next prime (221281).

It is a cyclic number.

It is not a de Polignac number, because 221271 - 2⁵ = 221239 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 221271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201) 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, 36876 + ... + 36881.

It is an arithmetic number, because the mean of its divisors is an integer number (73758).

2²²¹²⁷¹ is an apocalyptic number.

221271 is a deficient number, since it is larger than the sum of its proper divisors (73761).

221271 is an equidigital number, since it uses as much as digits as its factorization.

221271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73760.

The product of its digits is 56, while the sum is 15.

The square root of 221271 is about 470.3945152741. The cubic root of 221271 is about 60.4841385462.

Adding to 221271 its reverse (172122), we get a palindrome (393393).

The spelling of 221271 in words is "two hundred twenty-one thousand, two hundred seventy-one", and thus it is an iban number.