2172111112217 has 8 divisors (see below), whose sum is σ = 2174116687776. Its totient is φ = 2170105834752.

The previous prime is 2172111112207. The next prime is 2172111112243. The reversal of 2172111112217 is 7122111112712.

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 2172111112217 - 2²⁴ = 2172094335001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2172111112217.

It is not an unprimeable number, because it can be changed into a prime (2172111112207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16115258 + ... + 16249484.

It is an arithmetic number, because the mean of its divisors is an integer number (271764585972).

Almost surely, 2^{2172111112217} is an apocalyptic number.

It is an amenable number.

2172111112217 is a deficient number, since it is larger than the sum of its proper divisors (2005575559).

2172111112217 is a wasteful number, since it uses less digits than its factorization.

2172111112217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149047.

The product of its digits is 784, while the sum is 29.

Adding to 2172111112217 its reverse (7122111112712), we get a palindrome (9294222224929).

The spelling of 2172111112217 in words is "two trillion, one hundred seventy-two billion, one hundred eleven million, one hundred twelve thousand, two hundred seventeen".