243213215 has 12 divisors (see below), whose sum is σ = 339506136. Its totient is φ = 166774608.

The previous prime is 243213209. The next prime is 243213239. The reversal of 243213215 is 512312342.

It is not a de Polignac number, because 243213215 - 2⁴ = 243213199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 496109 + ... + 496598.

It is an arithmetic number, because the mean of its divisors is an integer number (28292178).

Almost surely, 2^243213215 is an apocalyptic number.

243213215 is a deficient number, since it is larger than the sum of its proper divisors (96292921).

243213215 is an equidigital number, since it uses as much as digits as its factorization.

243213215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992726 (or 992719 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 243213215 is about 15595.2946429364. The cubic root of 243213215 is about 624.2076059365.

Adding to 243213215 its reverse (512312342), we get a palindrome (755525557).

The spelling of 243213215 in words is "two hundred forty-three million, two hundred thirteen thousand, two hundred fifteen".