12102120111 has 4 divisors (see below), whose sum is σ = 16136160152. Its totient is φ = 8068080072.

The previous prime is 12102120109. The next prime is 12102120113. The reversal of 12102120111 is 11102120121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11102120121 = 3 ⋅3700706707.

It is an interprime number because it is at equal distance from previous prime (12102120109) and next prime (12102120113).

It is not a de Polignac number, because 12102120111 - 2¹ = 12102120109 is a prime.

It is a super-2 number, since 2×12102120111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102120113) 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, 2017020016 + ... + 2017020021.

It is an arithmetic number, because the mean of its divisors is an integer number (4034040038).

Almost surely, 2^12102120111 is an apocalyptic number.

12102120111 is a deficient number, since it is larger than the sum of its proper divisors (4034040041).

12102120111 is an equidigital number, since it uses as much as digits as its factorization.

12102120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4034040040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12102120111 its reverse (11102120121), we get a palindrome (23204240232).

The spelling of 12102120111 in words is "twelve billion, one hundred two million, one hundred twenty thousand, one hundred eleven".