12111220111 has 8 divisors (see below), whose sum is σ = 12455064144. Its totient is φ = 11771647680.

The previous prime is 12111220081. The next prime is 12111220127. The reversal of 12111220111 is 11102211121.

It is a happy number.

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

It is not a de Polignac number, because 12111220111 - 2⁷ = 12111219983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111220091 and 12111220100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111220181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062150 + ... + 1073491.

It is an arithmetic number, because the mean of its divisors is an integer number (1556883018).

Almost surely, 2^12111220111 is an apocalyptic number.

12111220111 is a deficient number, since it is larger than the sum of its proper divisors (343844033).

12111220111 is a wasteful number, since it uses less digits than its factorization.

12111220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135801.

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

Adding to 12111220111 its reverse (11102211121), we get a palindrome (23213431232).

The spelling of 12111220111 in words is "twelve billion, one hundred eleven million, two hundred twenty thousand, one hundred eleven".