846721221 has 8 divisors (see below), whose sum is σ = 1144862784. Its totient is φ = 556530240.

The previous prime is 846721219. The next prime is 846721237. The reversal of 846721221 is 122127648.

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

It is not a de Polignac number, because 846721221 - 2¹ = 846721219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (846721721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1987396 + ... + 1987821.

It is an arithmetic number, because the mean of its divisors is an integer number (143107848).

Almost surely, 2^846721221 is an apocalyptic number.

It is an amenable number.

846721221 is a deficient number, since it is larger than the sum of its proper divisors (298141563).

846721221 is a wasteful number, since it uses less digits than its factorization.

846721221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975291.

The product of its digits is 10752, while the sum is 33.

The square root of 846721221 is about 29098.4745476460. The cubic root of 846721221 is about 946.0486743173.

Adding to 846721221 its reverse (122127648), we get a palindrome (968848869).

The spelling of 846721221 in words is "eight hundred forty-six million, seven hundred twenty-one thousand, two hundred twenty-one".