9844736221 has 2 divisors, whose sum is σ = 9844736222. Its totient is φ = 9844736220.

The previous prime is 9844736219. The next prime is 9844736233. The reversal of 9844736221 is 1226374489.

It is a happy number.

9844736221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8683630596 + 1161105625 = 93186^2 + 34075^2 .

It is an emirp because it is prime and its reverse (1226374489) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9844736221 - 2¹ = 9844736219 is a prime.

It is a super-2 number, since 2×9844736221² (a number of 21 digits) contains 22 as substring.

Together with 9844736219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9844733221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4922368110 + 4922368111.

It is an arithmetic number, because the mean of its divisors is an integer number (4922368111).

Almost surely, 2^9844736221 is an apocalyptic number.

It is an amenable number.

9844736221 is a deficient number, since it is larger than the sum of its proper divisors (1).

9844736221 is an equidigital number, since it uses as much as digits as its factorization.

9844736221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 46.

The square root of 9844736221 is about 99220.6441271170. The cubic root of 9844736221 is about 2143.2262906477.

The spelling of 9844736221 in words is "nine billion, eight hundred forty-four million, seven hundred thirty-six thousand, two hundred twenty-one".