17211660172121 has 2 divisors, whose sum is σ = 17211660172122. Its totient is φ = 17211660172120.

The previous prime is 17211660172081. The next prime is 17211660172139. The reversal of 17211660172121 is 12127106611271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9669985315600 + 7541674856521 = 3109660^2 + 2746211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17211660172121 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (17211660172141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8605830086060 + 8605830086061.

It is an arithmetic number, because the mean of its divisors is an integer number (8605830086061).

Almost surely, 2^{17211660172121} is an apocalyptic number.

It is an amenable number.

17211660172121 is a deficient number, since it is larger than the sum of its proper divisors (1).

17211660172121 is an equidigital number, since it uses as much as digits as its factorization.

17211660172121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 38.

Adding to 17211660172121 its reverse (12127106611271), we get a palindrome (29338766783392).

The spelling of 17211660172121 in words is "seventeen trillion, two hundred eleven billion, six hundred sixty million, one hundred seventy-two thousand, one hundred twenty-one".