212211222009 has 4 divisors (see below), whose sum is σ = 282948296016. Its totient is φ = 141474148004.

The previous prime is 212211221953. The next prime is 212211222049. The reversal of 212211222009 is 900222112212.

212211222009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 212211222009 - 2²⁴ = 212194444793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212211222009.

It is not an unprimeable number, because it can be changed into a prime (212211222049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35368536999 + ... + 35368537004.

It is an arithmetic number, because the mean of its divisors is an integer number (70737074004).

Almost surely, 2^212211222009 is an apocalyptic number.

It is an amenable number.

212211222009 is a deficient number, since it is larger than the sum of its proper divisors (70737074007).

212211222009 is an equidigital number, since it uses as much as digits as its factorization.

212211222009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70737074006.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 212211222009 in words is "two hundred twelve billion, two hundred eleven million, two hundred twenty-two thousand, nine".