722441221 has 2 divisors, whose sum is σ = 722441222. Its totient is φ = 722441220.

The previous prime is 722441179. The next prime is 722441257. The reversal of 722441221 is 122144227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379821121 + 342620100 = 19489^2 + 18510^2 .

It is an emirp because it is prime and its reverse (122144227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722441221 - 2²¹ = 720344069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722441521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361220610 + 361220611.

It is an arithmetic number, because the mean of its divisors is an integer number (361220611).

Almost surely, 2^722441221 is an apocalyptic number.

It is an amenable number.

722441221 is a deficient number, since it is larger than the sum of its proper divisors (1).

722441221 is an equidigital number, since it uses as much as digits as its factorization.

722441221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 25.

The square root of 722441221 is about 26878.2667037888. The cubic root of 722441221 is about 897.2927787716.

Adding to 722441221 its reverse (122144227), we get a palindrome (844585448).

The spelling of 722441221 in words is "seven hundred twenty-two million, four hundred forty-one thousand, two hundred twenty-one".