12102011111 has 4 divisors (see below), whose sum is σ = 12128263224. Its totient is φ = 12075759000.

The previous prime is 12102011101. The next prime is 12102011137. The reversal of 12102011111 is 11111020121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12102011111 - 2¹⁰ = 12102010087 is a prime.

It is a super-3 number, since 3×12102011111³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12102011092 and 12102011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12102011101) 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, 13125365 + ... + 13126286.

It is an arithmetic number, because the mean of its divisors is an integer number (3032065806).

Almost surely, 2^12102011111 is an apocalyptic number.

12102011111 is a deficient number, since it is larger than the sum of its proper divisors (26252113).

12102011111 is an equidigital number, since it uses as much as digits as its factorization.

12102011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26252112.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12102011111 its reverse (11111020121), we get a palindrome (23213031232).

The spelling of 12102011111 in words is "twelve billion, one hundred two million, eleven thousand, one hundred eleven".