847221 has 4 divisors (see below), whose sum is σ = 1129632. Its totient is φ = 564812.

The previous prime is 847219. The next prime is 847237. The reversal of 847221 is 122748.

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 a cyclic number.

It is not a de Polignac number, because 847221 - 2¹ = 847219 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 847191 and 847200.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 847221.

It is not an unprimeable number, because it can be changed into a prime (847201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141201 + ... + 141206.

It is an arithmetic number, because the mean of its divisors is an integer number (282408).

2⁸⁴⁷²²¹ is an apocalyptic number.

It is an amenable number.

847221 is a deficient number, since it is larger than the sum of its proper divisors (282411).

847221 is a wasteful number, since it uses less digits than its factorization.

847221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282410.

The product of its digits is 896, while the sum is 24.

The square root of 847221 is about 920.4460875032. The cubic root of 847221 is about 94.6234773454.

Adding to 847221 its reverse (122748), we get a palindrome (969969).

The spelling of 847221 in words is "eight hundred forty-seven thousand, two hundred twenty-one".