211122111209 has 2 divisors, whose sum is σ = 211122111210. Its totient is φ = 211122111208.

The previous prime is 211122111191. The next prime is 211122111241. The reversal of 211122111209 is 902111221112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182844325609 + 28277785600 = 427603^2 + 168160^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122111209 - 2²⁴ = 211105333993 is a prime.

It is not a weakly prime, because it can be changed into another prime (211122111509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561055604 + 105561055605.

It is an arithmetic number, because the mean of its divisors is an integer number (105561055605).

Almost surely, 2^211122111209 is an apocalyptic number.

It is an amenable number.

211122111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122111209 is an equidigital number, since it uses as much as digits as its factorization.

211122111209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 211122111209 in words is "two hundred eleven billion, one hundred twenty-two million, one hundred eleven thousand, two hundred nine".