212073209 has 4 divisors (see below), whose sum is σ = 214757760. Its totient is φ = 209388660.

The previous prime is 212073187. The next prime is 212073241. The reversal of 212073209 is 902370212.

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 212073209 - 2¹² = 212069113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212013209) 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, 1342157 + ... + 1342314.

It is an arithmetic number, because the mean of its divisors is an integer number (53689440).

Almost surely, 2^212073209 is an apocalyptic number.

It is an amenable number.

212073209 is a deficient number, since it is larger than the sum of its proper divisors (2684551).

212073209 is an equidigital number, since it uses as much as digits as its factorization.

212073209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684550.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 212073209 is about 14562.7335689423. The cubic root of 212073209 is about 596.3418239828.

The spelling of 212073209 in words is "two hundred twelve million, seventy-three thousand, two hundred nine".