217021671701 has 2 divisors, whose sum is σ = 217021671702. Its totient is φ = 217021671700.

The previous prime is 217021671689. The next prime is 217021671707. The reversal of 217021671701 is 107176120712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207388249201 + 9633422500 = 455399^2 + 98150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217021671701 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217021671707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108510835850 + 108510835851.

It is an arithmetic number, because the mean of its divisors is an integer number (108510835851).

Almost surely, 2^217021671701 is an apocalyptic number.

It is an amenable number.

217021671701 is a deficient number, since it is larger than the sum of its proper divisors (1).

217021671701 is an equidigital number, since it uses as much as digits as its factorization.

217021671701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8232, while the sum is 35.

The spelling of 217021671701 in words is "two hundred seventeen billion, twenty-one million, six hundred seventy-one thousand, seven hundred one".