858221 has 8 divisors (see below), whose sum is σ = 1056384. Its totient is φ = 678960.

The previous prime is 858217. The next prime is 858223. The reversal of 858221 is 122858.

858221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 858221 - 2² = 858217 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4625 + ... + 4806.

It is an arithmetic number, because the mean of its divisors is an integer number (132048).

2⁸⁵⁸²²¹ is an apocalyptic number.

It is an amenable number.

858221 is a deficient number, since it is larger than the sum of its proper divisors (198163).

858221 is a wasteful number, since it uses less digits than its factorization.

858221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451.

The product of its digits is 1280, while the sum is 26.

The square root of 858221 is about 926.4021804810. The cubic root of 858221 is about 95.0312362657.

The spelling of 858221 in words is "eight hundred fifty-eight thousand, two hundred twenty-one".