212212109 has 4 divisors (see below), whose sum is σ = 212262816. Its totient is φ = 212161404.

The previous prime is 212212093. The next prime is 212212123. The reversal of 212212109 is 901212212.

It is a happy number.

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 212212109 - 2⁴ = 212212093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212212129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18449 + ... + 27654.

It is an arithmetic number, because the mean of its divisors is an integer number (53065704).

Almost surely, 2^212212109 is an apocalyptic number.

It is an amenable number.

212212109 is a deficient number, since it is larger than the sum of its proper divisors (50707).

212212109 is an equidigital number, since it uses as much as digits as its factorization.

212212109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50706.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 212212109 is about 14567.5018105370. The cubic root of 212212109 is about 596.4719894139.

The spelling of 212212109 in words is "two hundred twelve million, two hundred twelve thousand, one hundred nine".