12161111171 has 12 divisors (see below), whose sum is σ = 13369838832. Its totient is φ = 11053350000.

The previous prime is 12161111167. The next prime is 12161111201. The reversal of 12161111171 is 17111116121.

It is a happy number.

It is not a de Polignac number, because 12161111171 - 2² = 12161111167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12161111371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1192946 + ... + 1203096.

It is an arithmetic number, because the mean of its divisors is an integer number (1114153236).

Almost surely, 2^12161111171 is an apocalyptic number.

12161111171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12161111171 is a deficient number, since it is larger than the sum of its proper divisors (1208727661).

12161111171 is a wasteful number, since it uses less digits than its factorization.

12161111171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20074 (or 20063 counting only the distinct ones).

The product of its digits is 84, while the sum is 23.

Adding to 12161111171 its reverse (17111116121), we get a palindrome (29272227292).

The spelling of 12161111171 in words is "twelve billion, one hundred sixty-one million, one hundred eleven thousand, one hundred seventy-one".