7347075721 has 2 divisors, whose sum is σ = 7347075722. Its totient is φ = 7347075720.

The previous prime is 7347075709. The next prime is 7347075739. The reversal of 7347075721 is 1275707437.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6890826121 + 456249600 = 83011^2 + 21360^2 .

It is an emirp because it is prime and its reverse (1275707437) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7347075721 - 2⁵ = 7347075689 is a prime.

It is not a weakly prime, because it can be changed into another prime (7347075751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3673537860 + 3673537861.

It is an arithmetic number, because the mean of its divisors is an integer number (3673537861).

Almost surely, 2^7347075721 is an apocalyptic number.

It is an amenable number.

7347075721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7347075721 is an equidigital number, since it uses as much as digits as its factorization.

7347075721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288120, while the sum is 43.

The square root of 7347075721 is about 85715.0845592536. The cubic root of 7347075721 is about 1944.0383975245.

The spelling of 7347075721 in words is "seven billion, three hundred forty-seven million, seventy-five thousand, seven hundred twenty-one".