9717472021 has 2 divisors, whose sum is σ = 9717472022. Its totient is φ = 9717472020.

The previous prime is 9717471991. The next prime is 9717472057. The reversal of 9717472021 is 1202747179.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9700083121 + 17388900 = 98489^2 + 4170^2 .

It is a cyclic number.

It is not a de Polignac number, because 9717472021 - 2¹¹ = 9717469973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9717472621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4858736010 + 4858736011.

It is an arithmetic number, because the mean of its divisors is an integer number (4858736011).

Almost surely, 2^9717472021 is an apocalyptic number.

It is an amenable number.

9717472021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9717472021 is an equidigital number, since it uses as much as digits as its factorization.

9717472021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 9717472021 is about 98577.2388586737. The cubic root of 9717472021 is about 2133.9509511875.

The spelling of 9717472021 in words is "nine billion, seven hundred seventeen million, four hundred seventy-two thousand, twenty-one".