722255221 has 16 divisors (see below), whose sum is σ = 756468720. Its totient is φ = 688929280.

The previous prime is 722255161. The next prime is 722255249. The reversal of 722255221 is 122552227.

It can be written as a sum of positive squares in 8 ways, for example, as 13950225 + 708304996 = 3735^2 + 26614^2 .

It is a cyclic number.

It is not a de Polignac number, because 722255221 - 2¹⁷ = 722124149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722255221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722255291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1105731 + ... + 1106383.

It is an arithmetic number, because the mean of its divisors is an integer number (47279295).

Almost surely, 2^722255221 is an apocalyptic number.

It is an amenable number.

722255221 is a deficient number, since it is larger than the sum of its proper divisors (34213499).

722255221 is a wasteful number, since it uses less digits than its factorization.

722255221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256.

The product of its digits is 5600, while the sum is 28.

The square root of 722255221 is about 26874.8064365122. The cubic root of 722255221 is about 897.2157663785.

The spelling of 722255221 in words is "seven hundred twenty-two million, two hundred fifty-five thousand, two hundred twenty-one".