20112111209 has 2 divisors, whose sum is σ = 20112111210. Its totient is φ = 20112111208.

The previous prime is 20112111199. The next prime is 20112111221. The reversal of 20112111209 is 90211121102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355434025 + 7756677184 = 111155^2 + 88072^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112111209 - 2¹⁶ = 20112045673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20112111269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056055604 + 10056055605.

It is an arithmetic number, because the mean of its divisors is an integer number (10056055605).

Almost surely, 2^20112111209 is an apocalyptic number.

It is an amenable number.

20112111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112111209 is an equidigital number, since it uses as much as digits as its factorization.

20112111209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 20112111209 in words is "twenty billion, one hundred twelve million, one hundred eleven thousand, two hundred nine".