12110111221 has 16 divisors (see below), whose sum is σ = 13086529344. Its totient is φ = 11140182144.

The previous prime is 12110111173. The next prime is 12110111231. The reversal of 12110111221 is 12211101121.

It is a happy number.

It is not a de Polignac number, because 12110111221 - 2¹⁷ = 12109980149 is a prime.

It is a super-2 number, since 2×12110111221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12110111231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6775890 + ... + 6777676.

It is an arithmetic number, because the mean of its divisors is an integer number (817908084).

Almost surely, 2^12110111221 is an apocalyptic number.

It is an amenable number.

12110111221 is a deficient number, since it is larger than the sum of its proper divisors (976418123).

12110111221 is a wasteful number, since it uses less digits than its factorization.

12110111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300.

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

Adding to 12110111221 its reverse (12211101121), we get a palindrome (24321212342).

The spelling of 12110111221 in words is "twelve billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".