8458221 has 4 divisors (see below), whose sum is σ = 11277632. Its totient is φ = 5638812.

The previous prime is 8458193. The next prime is 8458253. The reversal of 8458221 is 1228548.

8458221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8458221 - 2⁵ = 8458189 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 (8458271) 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, 1409701 + ... + 1409706.

It is an arithmetic number, because the mean of its divisors is an integer number (2819408).

Almost surely, 2^8458221 is an apocalyptic number.

It is an amenable number.

8458221 is a deficient number, since it is larger than the sum of its proper divisors (2819411).

8458221 is a wasteful number, since it uses less digits than its factorization.

8458221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819410.

The product of its digits is 5120, while the sum is 30.

The square root of 8458221 is about 2908.3020819715. The cubic root of 8458221 is about 203.7478381845.

The spelling of 8458221 in words is "eight million, four hundred fifty-eight thousand, two hundred twenty-one".