52505020721 has 2 divisors, whose sum is σ = 52505020722. Its totient is φ = 52505020720.

The previous prime is 52505020697. The next prime is 52505020723. The reversal of 52505020721 is 12702050525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42948003121 + 9557017600 = 207239^2 + 97760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52505020721 is a prime.

Together with 52505020723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52505020723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26252510360 + 26252510361.

It is an arithmetic number, because the mean of its divisors is an integer number (26252510361).

Almost surely, 2^52505020721 is an apocalyptic number.

It is an amenable number.

52505020721 is a deficient number, since it is larger than the sum of its proper divisors (1).

52505020721 is an equidigital number, since it uses as much as digits as its factorization.

52505020721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7000, while the sum is 29.

The spelling of 52505020721 in words is "fifty-two billion, five hundred five million, twenty thousand, seven hundred twenty-one".