12012211111 has 8 divisors (see below), whose sum is σ = 12584774144. Its totient is φ = 11451215160.

The previous prime is 12012211069. The next prime is 12012211147. The reversal of 12012211111 is 11111221021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12012211111 - 2¹⁷ = 12012080039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012211091 and 12012211100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012211151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2889645 + ... + 2893798.

It is an arithmetic number, because the mean of its divisors is an integer number (1573096768).

Almost surely, 2^12012211111 is an apocalyptic number.

12012211111 is a deficient number, since it is larger than the sum of its proper divisors (572563033).

12012211111 is an equidigital number, since it uses as much as digits as its factorization.

12012211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5783541.

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

Adding to 12012211111 its reverse (11111221021), we get a palindrome (23123432132).

The spelling of 12012211111 in words is "twelve billion, twelve million, two hundred eleven thousand, one hundred eleven".