12172111 has 4 divisors (see below), whose sum is σ = 13910992. Its totient is φ = 10433232.

The previous prime is 12172087. The next prime is 12172117. The reversal of 12172111 is 11127121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11127121 = 37 ⋅300733.

It is a cyclic number.

It is not a de Polignac number, because 12172111 - 2⁵ = 12172079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12172117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869430 + ... + 869443.

It is an arithmetic number, because the mean of its divisors is an integer number (3477748).

Almost surely, 2^12172111 is an apocalyptic number.

12172111 is a deficient number, since it is larger than the sum of its proper divisors (1738881).

12172111 is an equidigital number, since it uses as much as digits as its factorization.

12172111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738880.

The product of its digits is 28, while the sum is 16.

The square root of 12172111 is about 3488.8552563842. The cubic root of 12172111 is about 230.0322009106.

Adding to 12172111 its reverse (11127121), we get a palindrome (23299232).

The spelling of 12172111 in words is "twelve million, one hundred seventy-two thousand, one hundred eleven".