12110111021 has 4 divisors (see below), whose sum is σ = 12315367200. Its totient is φ = 11904854844.

The previous prime is 12110111017. The next prime is 12110111029. The reversal of 12110111021 is 12011101121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12110111021 - 2² = 12110111017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12110110993 and 12110111011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12110111029) 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, 102628001 + ... + 102628118.

It is an arithmetic number, because the mean of its divisors is an integer number (3078841800).

Almost surely, 2^12110111021 is an apocalyptic number.

It is an amenable number.

12110111021 is a deficient number, since it is larger than the sum of its proper divisors (205256179).

12110111021 is an equidigital number, since it uses as much as digits as its factorization.

12110111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205256178.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12110111021 its reverse (12011101121), we get a palindrome (24121212142).

The spelling of 12110111021 in words is "twelve billion, one hundred ten million, one hundred eleven thousand, twenty-one".