17117672921 has 2 divisors, whose sum is σ = 17117672922. Its totient is φ = 17117672920.

The previous prime is 17117672917. The next prime is 17117672947. The reversal of 17117672921 is 12927671171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10089198025 + 7028474896 = 100445^2 + 83836^2 .

It is an emirp because it is prime and its reverse (12927671171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17117672921 - 2² = 17117672917 is a prime.

It is not a weakly prime, because it can be changed into another prime (17117672981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8558836460 + 8558836461.

It is an arithmetic number, because the mean of its divisors is an integer number (8558836461).

Almost surely, 2^17117672921 is an apocalyptic number.

It is an amenable number.

17117672921 is a deficient number, since it is larger than the sum of its proper divisors (1).

17117672921 is an equidigital number, since it uses as much as digits as its factorization.

17117672921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74088, while the sum is 44.

The spelling of 17117672921 in words is "seventeen billion, one hundred seventeen million, six hundred seventy-two thousand, nine hundred twenty-one".