212442009 has 8 divisors (see below), whose sum is σ = 305044992. Its totient is φ = 130733520.

The previous prime is 212442001. The next prime is 212442029. The reversal of 212442009 is 900244212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212442009 - 2³ = 212442001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212442009.

It is not an unprimeable number, because it can be changed into a prime (212442001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723577 + ... + 2723654.

It is an arithmetic number, because the mean of its divisors is an integer number (38130624).

Almost surely, 2^212442009 is an apocalyptic number.

It is an amenable number.

212442009 is a deficient number, since it is larger than the sum of its proper divisors (92602983).

212442009 is a wasteful number, since it uses less digits than its factorization.

212442009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5447247.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 212442009 is about 14575.3905265005. The cubic root of 212442009 is about 596.6873076651.

The spelling of 212442009 in words is "two hundred twelve million, four hundred forty-two thousand, nine".