4520265721 has 2 divisors, whose sum is σ = 4520265722. Its totient is φ = 4520265720.

The previous prime is 4520265689. The next prime is 4520265727. The reversal of 4520265721 is 1275620254.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4509794025 + 10471696 = 67155^2 + 3236^2 .

It is a cyclic number.

It is not a de Polignac number, because 4520265721 - 2⁵ = 4520265689 is a prime.

It is not a weakly prime, because it can be changed into another prime (4520265727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2260132860 + 2260132861.

It is an arithmetic number, because the mean of its divisors is an integer number (2260132861).

Almost surely, 2^4520265721 is an apocalyptic number.

It is an amenable number.

4520265721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4520265721 is an equidigital number, since it uses as much as digits as its factorization.

4520265721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 4520265721 is about 67232.9214075961. The cubic root of 4520265721 is about 1653.4382813040.

Adding to 4520265721 its reverse (1275620254), we get a palindrome (5795885975).

The spelling of 4520265721 in words is "four billion, five hundred twenty million, two hundred sixty-five thousand, seven hundred twenty-one".