17117186921 has 8 divisors (see below), whose sum is σ = 17233571784. Its totient is φ = 17001002880.

The previous prime is 17117186917. The next prime is 17117186953. The reversal of 17117186921 is 12968171171.

It can be written as a sum of positive squares in 4 ways, for example, as 15031986025 + 2085200896 = 122605^2 + 45664^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17117186921 - 2² = 17117186917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (17117786921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122861 + ... + 222101.

It is an arithmetic number, because the mean of its divisors is an integer number (2154196473).

Almost surely, 2^17117186921 is an apocalyptic number.

It is an amenable number.

17117186921 is a deficient number, since it is larger than the sum of its proper divisors (116384863).

17117186921 is an equidigital number, since it uses as much as digits as its factorization.

17117186921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100411.

The product of its digits is 42336, while the sum is 44.

The spelling of 17117186921 in words is "seventeen billion, one hundred seventeen million, one hundred eighty-six thousand, nine hundred twenty-one".