12211113209 has 4 divisors (see below), whose sum is σ = 12929414004. Its totient is φ = 11492812416.

The previous prime is 12211113203. The next prime is 12211113221. The reversal of 12211113209 is 90231111221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90231111221 = 503 ⋅179385907.

It can be written as a sum of positive squares in 2 ways, for example, as 3943212025 + 8267901184 = 62795^2 + 90928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211113209 is a prime.

It is a super-2 number, since 2×12211113209² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12211113203) 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, 359150372 + ... + 359150405.

It is an arithmetic number, because the mean of its divisors is an integer number (3232353501).

Almost surely, 2^12211113209 is an apocalyptic number.

It is an amenable number.

12211113209 is a deficient number, since it is larger than the sum of its proper divisors (718300795).

12211113209 is an equidigital number, since it uses as much as digits as its factorization.

12211113209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718300794.

The product of its (nonzero) digits is 216, while the sum is 23.

The spelling of 12211113209 in words is "twelve billion, two hundred eleven million, one hundred thirteen thousand, two hundred nine".