221701 has 4 divisors (see below), whose sum is σ = 224812. Its totient is φ = 218592.

The previous prime is 221677. The next prime is 221707. The reversal of 221701 is 107122.

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 159201 + 62500 = 399^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 221701 - 2¹⁵ = 188933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1446 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (56203).

2²²¹⁷⁰¹ is an apocalyptic number.

It is an amenable number.

221701 is a deficient number, since it is larger than the sum of its proper divisors (3111).

221701 is an equidigital number, since it uses as much as digits as its factorization.

221701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110.

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

The square root of 221701 is about 470.8513565872. The cubic root of 221701 is about 60.5232931731.

Adding to 221701 its reverse (107122), we get a palindrome (328823).

The spelling of 221701 in words is "two hundred twenty-one thousand, seven hundred one", and thus it is an iban number.