9917211171 has 128 divisors (see below), whose sum is σ = 17169408000. Its totient is φ = 4961746944.

The previous prime is 9917211169. The next prime is 9917211181. The reversal of 9917211171 is 1711127199.

It is not a de Polignac number, because 9917211171 - 2¹ = 9917211169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9917211151) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 43306485 + ... + 43306713.

It is an arithmetic number, because the mean of its divisors is an integer number (134136000).

Almost surely, 2^9917211171 is an apocalyptic number.

9917211171 is a deficient number, since it is larger than the sum of its proper divisors (7252196829).

9917211171 is a wasteful number, since it uses less digits than its factorization.

9917211171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421.

The product of its digits is 7938, while the sum is 39.

The square root of 9917211171 is about 99585.1955413052. The cubic root of 9917211171 is about 2148.4727694515.

The spelling of 9917211171 in words is "nine billion, nine hundred seventeen million, two hundred eleven thousand, one hundred seventy-one".