12101111109 has 24 divisors (see below), whose sum is σ = 17961004152. Its totient is φ = 7845344640.

The previous prime is 12101111107. The next prime is 12101111117. The reversal of 12101111109 is 90111110121.

It can be written as a sum of positive squares in 4 ways, for example, as 4170318084 + 7930793025 = 64578^2 + 89055^2 .

It is not a de Polignac number, because 12101111109 - 2¹ = 12101111107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101111091 and 12101111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12101111101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 728719 + ... + 745139.

It is an arithmetic number, because the mean of its divisors is an integer number (748375173).

Almost surely, 2^12101111109 is an apocalyptic number.

It is an amenable number.

12101111109 is a deficient number, since it is larger than the sum of its proper divisors (5859893043).

12101111109 is a wasteful number, since it uses less digits than its factorization.

12101111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18677 (or 18674 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 18.

The spelling of 12101111109 in words is "twelve billion, one hundred one million, one hundred eleven thousand, one hundred nine".