856344221 has 8 divisors (see below), whose sum is σ = 866595840. Its totient is φ = 846136368.

The previous prime is 856344199. The next prime is 856344253. The reversal of 856344221 is 122443658.

856344221 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 856344221 - 2¹⁸ = 856082077 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 (856344521) 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, 29300 + ... + 50706.

It is an arithmetic number, because the mean of its divisors is an integer number (108324480).

Almost surely, 2^856344221 is an apocalyptic number.

It is an amenable number.

856344221 is a deficient number, since it is larger than the sum of its proper divisors (10251619).

856344221 is a wasteful number, since it uses less digits than its factorization.

856344221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21883.

The product of its digits is 46080, while the sum is 35.

The square root of 856344221 is about 29263.3597011690. The cubic root of 856344221 is about 949.6191348621.

Adding to 856344221 its reverse (122443658), we get a palindrome (978787879).

The spelling of 856344221 in words is "eight hundred fifty-six million, three hundred forty-four thousand, two hundred twenty-one".