7226245721 has 2 divisors, whose sum is σ = 7226245722. Its totient is φ = 7226245720.

The previous prime is 7226245717. The next prime is 7226245757. The reversal of 7226245721 is 1275426227.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6570885721 + 655360000 = 81061^2 + 25600^2 .

It is an emirp because it is prime and its reverse (1275426227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7226245721 - 2² = 7226245717 is a prime.

It is not a weakly prime, because it can be changed into another prime (7226245021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3613122860 + 3613122861.

It is an arithmetic number, because the mean of its divisors is an integer number (3613122861).

Almost surely, 2^7226245721 is an apocalyptic number.

It is an amenable number.

7226245721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7226245721 is an equidigital number, since it uses as much as digits as its factorization.

7226245721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 38.

The square root of 7226245721 is about 85007.3274547553. The cubic root of 7226245721 is about 1933.3222170949.

The spelling of 7226245721 in words is "seven billion, two hundred twenty-six million, two hundred forty-five thousand, seven hundred twenty-one".