5216707721 has 2 divisors, whose sum is σ = 5216707722. Its totient is φ = 5216707720.

The previous prime is 5216707709. The next prime is 5216707729. The reversal of 5216707721 is 1277076125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3742992400 + 1473715321 = 61180^2 + 38389^2 .

It is a cyclic number.

It is not a de Polignac number, because 5216707721 - 2¹⁰ = 5216706697 is a prime.

It is not a weakly prime, because it can be changed into another prime (5216707729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2608353860 + 2608353861.

It is an arithmetic number, because the mean of its divisors is an integer number (2608353861).

Almost surely, 2^5216707721 is an apocalyptic number.

It is an amenable number.

5216707721 is a deficient number, since it is larger than the sum of its proper divisors (1).

5216707721 is an equidigital number, since it uses as much as digits as its factorization.

5216707721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41160, while the sum is 38.

The square root of 5216707721 is about 72226.7798050003. The cubic root of 5216707721 is about 1734.3317245706.

The spelling of 5216707721 in words is "five billion, two hundred sixteen million, seven hundred seven thousand, seven hundred twenty-one".