844066221 has 16 divisors (see below), whose sum is σ = 1179689280. Its totient is φ = 536215680.

The previous prime is 844066207. The next prime is 844066229. The reversal of 844066221 is 122660448.

It is not a de Polignac number, because 844066221 - 2⁵ = 844066189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (844066229) 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, 74506 + ... + 85083.

It is an arithmetic number, because the mean of its divisors is an integer number (73730580).

Almost surely, 2^844066221 is an apocalyptic number.

It is an amenable number.

844066221 is a deficient number, since it is larger than the sum of its proper divisors (335623059).

844066221 is a wasteful number, since it uses less digits than its factorization.

844066221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159676.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 844066221 is about 29052.8177807248. The cubic root of 844066221 is about 945.0588211196.

The spelling of 844066221 in words is "eight hundred forty-four million, sixty-six thousand, two hundred twenty-one".