2112311220109 has 4 divisors (see below), whose sum is σ = 2112628724316. Its totient is φ = 2111993715904.

The previous prime is 2112311220083. The next prime is 2112311220119. The reversal of 2112311220109 is 9010221132112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 908456796900 + 1203854423209 = 953130^2 + 1097203^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112311220109 - 2²⁵ = 2112277665677 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 (2112311220119) 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, 158742124 + ... + 158755429.

It is an arithmetic number, because the mean of its divisors is an integer number (528157181079).

Almost surely, 2^{2112311220109} is an apocalyptic number.

It is an amenable number.

2112311220109 is a deficient number, since it is larger than the sum of its proper divisors (317504207).

2112311220109 is an equidigital number, since it uses as much as digits as its factorization.

2112311220109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317504206.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 2112311220109 in words is "two trillion, one hundred twelve billion, three hundred eleven million, two hundred twenty thousand, one hundred nine".