211122211009 has 2 divisors, whose sum is σ = 211122211010. Its totient is φ = 211122211008.

The previous prime is 211122211007. The next prime is 211122211031. The reversal of 211122211009 is 900112221112.

It is an a-pointer prime, because the next prime (211122211031) can be obtained adding 211122211009 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180393873984 + 30728337025 = 424728^2 + 175295^2 .

It is a cyclic number.

It is not a de Polignac number, because 211122211009 - 2¹ = 211122211007 is a prime.

Together with 211122211007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (211122211007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105561105504 + 105561105505.

It is an arithmetic number, because the mean of its divisors is an integer number (105561105505).

Almost surely, 2^211122211009 is an apocalyptic number.

It is an amenable number.

211122211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

211122211009 is an equidigital number, since it uses as much as digits as its factorization.

211122211009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 211122211009 in words is "two hundred eleven billion, one hundred twenty-two million, two hundred eleven thousand, nine".