844222221 has 6 divisors (see below), whose sum is σ = 1219432110. Its totient is φ = 562814808.

The previous prime is 844222201. The next prime is 844222237. The reversal of 844222221 is 122222448.

844222221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 481319721 + 362902500 = 21939^2 + 19050^2 .

It is not a de Polignac number, because 844222221 - 2⁶ = 844222157 is a prime.

It is a super-2 number, since 2×844222221² = 1425422316860345682, which contains 22 as substring.

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 (844222201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46901226 + ... + 46901243.

It is an arithmetic number, because the mean of its divisors is an integer number (203238685).

Almost surely, 2^844222221 is an apocalyptic number.

It is an amenable number.

844222221 is a deficient number, since it is larger than the sum of its proper divisors (375209889).

844222221 is a wasteful number, since it uses less digits than its factorization.

844222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93802475 (or 93802472 counting only the distinct ones).

The product of its digits is 4096, while the sum is 27.

The square root of 844222221 is about 29055.5024220887. The cubic root of 844222221 is about 945.1170393378.

Adding to 844222221 its reverse (122222448), we get a palindrome (966444669).

The spelling of 844222221 in words is "eight hundred forty-four million, two hundred twenty-two thousand, two hundred twenty-one".