17142021909 has 6 divisors (see below), whose sum is σ = 24760698326. Its totient is φ = 11428014600.

The previous prime is 17142021833. The next prime is 17142021929. The reversal of 17142021909 is 90912024171.

17142021909 is a `hidden beast` number, since 17 + 1 + 420 + 219 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16959852900 + 182169009 = 130230^2 + 13497^2 .

It is not a de Polignac number, because 17142021909 - 2¹⁵ = 17141989141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17142021929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 952334542 + ... + 952334559.

Almost surely, 2^17142021909 is an apocalyptic number.

It is an amenable number.

17142021909 is a deficient number, since it is larger than the sum of its proper divisors (7618676417).

17142021909 is a wasteful number, since it uses less digits than its factorization.

17142021909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904669107 (or 1904669104 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 17142021909 in words is "seventeen billion, one hundred forty-two million, twenty-one thousand, nine hundred nine".