34520520721 has 2 divisors, whose sum is σ = 34520520722. Its totient is φ = 34520520720.

The previous prime is 34520520719. The next prime is 34520520731. The reversal of 34520520721 is 12702502543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24806250000 + 9714270721 = 157500^2 + 98561^2 .

It is a cyclic number.

It is not a de Polignac number, because 34520520721 - 2¹ = 34520520719 is a prime.

Together with 34520520719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (34520520731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17260260360 + 17260260361.

It is an arithmetic number, because the mean of its divisors is an integer number (17260260361).

Almost surely, 2^34520520721 is an apocalyptic number.

It is an amenable number.

34520520721 is a deficient number, since it is larger than the sum of its proper divisors (1).

34520520721 is an equidigital number, since it uses as much as digits as its factorization.

34520520721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 31.

The spelling of 34520520721 in words is "thirty-four billion, five hundred twenty million, five hundred twenty thousand, seven hundred twenty-one".