720122521 has 2 divisors, whose sum is σ = 720122522. Its totient is φ = 720122520.

The previous prime is 720122509. The next prime is 720122539. The reversal of 720122521 is 125221027.

720122521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 713691225 + 6431296 = 26715^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 720122521 - 2⁷ = 720122393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 720122492 and 720122501.

It is not a weakly prime, because it can be changed into another prime (720122321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360061260 + 360061261.

It is an arithmetic number, because the mean of its divisors is an integer number (360061261).

Almost surely, 2^720122521 is an apocalyptic number.

It is an amenable number.

720122521 is a deficient number, since it is larger than the sum of its proper divisors (1).

720122521 is an equidigital number, since it uses as much as digits as its factorization.

720122521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 720122521 is about 26835.0986769194. The cubic root of 720122521 is about 896.3317858901.

Adding to 720122521 its reverse (125221027), we get a palindrome (845343548).

The spelling of 720122521 in words is "seven hundred twenty million, one hundred twenty-two thousand, five hundred twenty-one".