212816215 has 4 divisors (see below), whose sum is σ = 255379464. Its totient is φ = 170252968.

The previous prime is 212816213. The next prime is 212816273. The reversal of 212816215 is 512618212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212816215 - 2¹ = 212816213 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 (212816213) 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, 21281617 + ... + 21281626.

It is an arithmetic number, because the mean of its divisors is an integer number (63844866).

Almost surely, 2^212816215 is an apocalyptic number.

212816215 is a deficient number, since it is larger than the sum of its proper divisors (42563249).

212816215 is an equidigital number, since it uses as much as digits as its factorization.

212816215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42563248.

The product of its digits is 1920, while the sum is 28.

The square root of 212816215 is about 14588.2217901977. The cubic root of 212816215 is about 597.0374471356.

The spelling of 212816215 in words is "two hundred twelve million, eight hundred sixteen thousand, two hundred fifteen".