12211211009 has 2 divisors, whose sum is σ = 12211211010. Its totient is φ = 12211211008.

The previous prime is 12211211003. The next prime is 12211211011. The reversal of 12211211009 is 90011211221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8446161409 + 3765049600 = 91903^2 + 61360^2 .

It is an emirp because it is prime and its reverse (90011211221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211211009 is a prime.

It is a super-2 number, since 2×12211211009² (a number of 21 digits) contains 22 as substring.

Together with 12211211011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12211211003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105605504 + 6105605505.

It is an arithmetic number, because the mean of its divisors is an integer number (6105605505).

Almost surely, 2^12211211009 is an apocalyptic number.

It is an amenable number.

12211211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211211009 is an equidigital number, since it uses as much as digits as its factorization.

12211211009 is an evil number, because the sum of its binary digits is even.

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

The spelling of 12211211009 in words is "twelve billion, two hundred eleven million, two hundred eleven thousand, nine".