12012220111 has 4 divisors (see below), whose sum is σ = 12718821312. Its totient is φ = 11305618912.

The previous prime is 12012220093. The next prime is 12012220127. The reversal of 12012220111 is 11102221021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11102221021 = 443 ⋅25061447.

It is a cyclic number.

It is not a de Polignac number, because 12012220111 - 2⁵ = 12012220079 is a prime.

It is a super-2 number, since 2×12012220111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012220091 and 12012220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012220141) 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, 353300575 + ... + 353300608.

It is an arithmetic number, because the mean of its divisors is an integer number (3179705328).

Almost surely, 2^12012220111 is an apocalyptic number.

12012220111 is a deficient number, since it is larger than the sum of its proper divisors (706601201).

12012220111 is an equidigital number, since it uses as much as digits as its factorization.

12012220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706601200.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12012220111 its reverse (11102221021), we get a palindrome (23114441132).

The spelling of 12012220111 in words is "twelve billion, twelve million, two hundred twenty thousand, one hundred eleven".