853221 has 4 divisors (see below), whose sum is σ = 1137632. Its totient is φ = 568812.

The previous prime is 853217. The next prime is 853241. The reversal of 853221 is 122358.

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 853221 - 2² = 853217 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853211) 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, 142201 + ... + 142206.

It is an arithmetic number, because the mean of its divisors is an integer number (284408).

2⁸⁵³²²¹ is an apocalyptic number.

It is an amenable number.

853221 is a deficient number, since it is larger than the sum of its proper divisors (284411).

853221 is a wasteful number, since it uses less digits than its factorization.

853221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284410.

The product of its digits is 480, while the sum is 21.

The square root of 853221 is about 923.6996265020. The cubic root of 853221 is about 94.8463258779.

Adding to 853221 its reverse (122358), we get a palindrome (975579).

The spelling of 853221 in words is "eight hundred fifty-three thousand, two hundred twenty-one".