12021112111 has 4 divisors (see below), whose sum is σ = 12021454432. Its totient is φ = 12020769792.

The previous prime is 12021112091. The next prime is 12021112123. The reversal of 12021112111 is 11121112021.

It is a happy number.

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 12021112111 - 2¹¹ = 12021110063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021112091 and 12021112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021812111) 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, 111570 + ... + 191023.

It is an arithmetic number, because the mean of its divisors is an integer number (3005363608).

Almost surely, 2^12021112111 is an apocalyptic number.

12021112111 is a deficient number, since it is larger than the sum of its proper divisors (342321).

12021112111 is an equidigital number, since it uses as much as digits as its factorization.

12021112111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342320.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 12021112111 its reverse (11121112021), we get a palindrome (23142224132).

The spelling of 12021112111 in words is "twelve billion, twenty-one million, one hundred twelve thousand, one hundred eleven".