859221 has 24 divisors (see below), whose sum is σ = 1404480. Its totient is φ = 518760.

The previous prime is 859213. The next prime is 859223. The reversal of 859221 is 122958.

859221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 859221 - 2³ = 859213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (859223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3136 + ... + 3398.

It is an arithmetic number, because the mean of its divisors is an integer number (58520).

2⁸⁵⁹²²¹ is an apocalyptic number.

It is an amenable number.

859221 is a deficient number, since it is larger than the sum of its proper divisors (545259).

859221 is a wasteful number, since it uses less digits than its factorization.

859221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 277 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 859221 is about 926.9417457424. The cubic root of 859221 is about 95.0681321041.

The spelling of 859221 in words is "eight hundred fifty-nine thousand, two hundred twenty-one".