7225756221 has 16 divisors (see below), whose sum is σ = 10200047040. Its totient is φ = 4537249920.

The previous prime is 7225756193. The next prime is 7225756243. The reversal of 7225756221 is 1226575227.

7225756221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7225756221 - 2⁵ = 7225756189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7225756221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7225756121) 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, 356520 + ... + 376241.

It is an arithmetic number, because the mean of its divisors is an integer number (637502940).

Almost surely, 2^7225756221 is an apocalyptic number.

It is an amenable number.

7225756221 is a deficient number, since it is larger than the sum of its proper divisors (2974290819).

7225756221 is a wasteful number, since it uses less digits than its factorization.

7225756221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732956.

The product of its digits is 117600, while the sum is 39.

The square root of 7225756221 is about 85004.4482424302. The cubic root of 7225756221 is about 1933.2785622183.

The spelling of 7225756221 in words is "seven billion, two hundred twenty-five million, seven hundred fifty-six thousand, two hundred twenty-one".