111221016171 has 32 divisors (see below), whose sum is σ = 153515865600. Its totient is φ = 71592787200.

The previous prime is 111221016157. The next prime is 111221016199. The reversal of 111221016171 is 171610122111.

It is a happy number.

It is not a de Polignac number, because 111221016171 - 2⁶ = 111221016107 is a prime.

It is a super-2 number, since 2×111221016171² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (111221012171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2355325 + ... + 2402081.

It is an arithmetic number, because the mean of its divisors is an integer number (4797370800).

Almost surely, 2^111221016171 is an apocalyptic number.

111221016171 is a deficient number, since it is larger than the sum of its proper divisors (42294849429).

111221016171 is a wasteful number, since it uses less digits than its factorization.

111221016171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47059.

The product of its (nonzero) digits is 168, while the sum is 24.

Adding to 111221016171 its reverse (171610122111), we get a palindrome (282831138282).

The spelling of 111221016171 in words is "one hundred eleven billion, two hundred twenty-one million, sixteen thousand, one hundred seventy-one".