844630221 has 16 divisors (see below), whose sum is σ = 1145583936. Its totient is φ = 553435776.

The previous prime is 844630201. The next prime is 844630223. The reversal of 844630221 is 122036448.

It is not a de Polignac number, because 844630221 - 2⁷ = 844630093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844630223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57586 + ... + 70748.

It is an arithmetic number, because the mean of its divisors is an integer number (71598996).

Almost surely, 2^844630221 is an apocalyptic number.

It is an amenable number.

844630221 is a deficient number, since it is larger than the sum of its proper divisors (300953715).

844630221 is a wasteful number, since it uses less digits than its factorization.

844630221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 844630221 is about 29062.5226193460. The cubic root of 844630221 is about 945.2692684704.

Adding to 844630221 its reverse (122036448), we get a palindrome (966666669).

The spelling of 844630221 in words is "eight hundred forty-four million, six hundred thirty thousand, two hundred twenty-one".