12111122109 has 4 divisors (see below), whose sum is σ = 16148162816. Its totient is φ = 8074081404.

The previous prime is 12111122083. The next prime is 12111122117. The reversal of 12111122109 is 90122111121.

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 not a de Polignac number, because 12111122109 - 2¹² = 12111118013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111122119) 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, 2018520349 + ... + 2018520354.

It is an arithmetic number, because the mean of its divisors is an integer number (4037040704).

Almost surely, 2^12111122109 is an apocalyptic number.

It is an amenable number.

12111122109 is a deficient number, since it is larger than the sum of its proper divisors (4037040707).

12111122109 is an equidigital number, since it uses as much as digits as its factorization.

12111122109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037040706.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 12111122109 in words is "twelve billion, one hundred eleven million, one hundred twenty-two thousand, one hundred nine".