7221341721 has 16 divisors (see below), whose sum is σ = 10505200320. Its totient is φ = 4375974720.

The previous prime is 7221341713. The next prime is 7221341737. The reversal of 7221341721 is 1271431227.

7221341721 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 7221341721 - 2³ = 7221341713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7221341321) 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 in 15 ways as a sum of consecutive naturals, for example, 424251 + ... + 440943.

It is an arithmetic number, because the mean of its divisors is an integer number (656575020).

Almost surely, 2^7221341721 is an apocalyptic number.

It is an amenable number.

7221341721 is a deficient number, since it is larger than the sum of its proper divisors (3283858599).

7221341721 is a wasteful number, since it uses less digits than its factorization.

7221341721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29816.

The product of its digits is 4704, while the sum is 30.

The square root of 7221341721 is about 84978.4779870762. The cubic root of 7221341721 is about 1932.8847765921.

Adding to 7221341721 its reverse (1271431227), we get a palindrome (8492772948).

The spelling of 7221341721 in words is "seven billion, two hundred twenty-one million, three hundred forty-one thousand, seven hundred twenty-one".