212215009 has 8 divisors (see below), whose sum is σ = 223567040. Its totient is φ = 200881296.

The previous prime is 212215001. The next prime is 212215013. The reversal of 212215009 is 900512212.

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

It is a cyclic number.

It is not a de Polignac number, because 212215009 - 2³ = 212215001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212215001) 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, 23764 + ... + 31450.

It is an arithmetic number, because the mean of its divisors is an integer number (27945880).

Almost surely, 2^212215009 is an apocalyptic number.

It is an amenable number.

212215009 is a deficient number, since it is larger than the sum of its proper divisors (11352031).

212215009 is a wasteful number, since it uses less digits than its factorization.

212215009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9159.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 212215009 is about 14567.6013468244. The cubic root of 212215009 is about 596.4747064453.

The spelling of 212215009 in words is "two hundred twelve million, two hundred fifteen thousand, nine".