11112122171 has 2 divisors, whose sum is σ = 11112122172. Its totient is φ = 11112122170.

The previous prime is 11112122159. The next prime is 11112122191. The reversal of 11112122171 is 17122121111.

It is a happy number.

It is an a-pointer prime, because the next prime (11112122191) can be obtained adding 11112122171 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11112122171 is a prime.

It is not a weakly prime, because it can be changed into another prime (11112122101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556061085 + 5556061086.

It is an arithmetic number, because the mean of its divisors is an integer number (5556061086).

Almost surely, 2^11112122171 is an apocalyptic number.

11112122171 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112122171 is an equidigital number, since it uses as much as digits as its factorization.

11112122171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56, while the sum is 20.

Adding to 11112122171 its reverse (17122121111), we get a palindrome (28234243282).

The spelling of 11112122171 in words is "eleven billion, one hundred twelve million, one hundred twenty-two thousand, one hundred seventy-one".