860221 has 4 divisors (see below), whose sum is σ = 881244. Its totient is φ = 839200.

The previous prime is 860143. The next prime is 860239. The reversal of 860221 is 122068.

It is a happy number.

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 202500 + 657721 = 450^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 860221 - 2⁹ = 859709 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 (860291) 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, 10450 + ... + 10531.

It is an arithmetic number, because the mean of its divisors is an integer number (220311).

2⁸⁶⁰²²¹ is an apocalyptic number.

It is an amenable number.

860221 is a deficient number, since it is larger than the sum of its proper divisors (21023).

860221 is a wasteful number, since it uses less digits than its factorization.

860221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21022.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 860221 is about 927.4809971099. The cubic root of 860221 is about 95.1049993262.

Adding to 860221 its reverse (122068), we get a palindrome (982289).

It can be divided in two parts, 860 and 221, that added together give a triangular number (1081 = T₄₆).

The spelling of 860221 in words is "eight hundred sixty thousand, two hundred twenty-one".