12011211112171 has 2 divisors, whose sum is σ = 12011211112172. Its totient is φ = 12011211112170.

The previous prime is 12011211112169. The next prime is 12011211112213. The reversal of 12011211112171 is 17121111211021.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12011211112171 - 2¹ = 12011211112169 is a prime.

It is a super-2 number, since 2×12011211112171² (a number of 27 digits) contains 22 as substring.

Together with 12011211112169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12011271112171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6005605556085 + 6005605556086.

It is an arithmetic number, because the mean of its divisors is an integer number (6005605556086).

Almost surely, 2^{12011211112171} is an apocalyptic number.

12011211112171 is a deficient number, since it is larger than the sum of its proper divisors (1).

12011211112171 is an equidigital number, since it uses as much as digits as its factorization.

12011211112171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 22.

Adding to 12011211112171 its reverse (17121111211021), we get a palindrome (29132322323192).

The spelling of 12011211112171 in words is "twelve trillion, eleven billion, two hundred eleven million, one hundred twelve thousand, one hundred seventy-one".