212211022121209 has 4 divisors (see below), whose sum is σ = 221437588300416. Its totient is φ = 202984455942004.

The previous prime is 212211022121191. The next prime is 212211022121239. The reversal of 212211022121209 is 902121220112212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212211022121209 - 2⁷ = 212211022121081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212211022121239) 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, 4613283089569 + ... + 4613283089614.

It is an arithmetic number, because the mean of its divisors is an integer number (55359397075104).

Almost surely, 2^{212211022121209} is an apocalyptic number.

It is an amenable number.

212211022121209 is a deficient number, since it is larger than the sum of its proper divisors (9226566179207).

212211022121209 is an equidigital number, since it uses as much as digits as its factorization.

212211022121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9226566179206.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 212211022121209 in words is "two hundred twelve trillion, two hundred eleven billion, twenty-two million, one hundred twenty-one thousand, two hundred nine".