213210243 has 24 divisors (see below), whose sum is σ = 334908288. Its totient is φ = 130159872.

The previous prime is 213210241. The next prime is 213210259. The reversal of 213210243 is 342012312.

213210243 is a `hidden beast` number, since 213 + 210 + 243 = 666.

It is not a de Polignac number, because 213210243 - 2¹ = 213210241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213210241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13171 + ... + 24492.

It is an arithmetic number, because the mean of its divisors is an integer number (13954512).

Almost surely, 2^213210243 is an apocalyptic number.

213210243 is a deficient number, since it is larger than the sum of its proper divisors (121698045).

213210243 is a wasteful number, since it uses less digits than its factorization.

213210243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37723 (or 37720 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 213210243 is about 14601.7205493051. The cubic root of 213210243 is about 597.4056904306.

Adding to 213210243 its reverse (342012312), we get a palindrome (555222555).

The spelling of 213210243 in words is "two hundred thirteen million, two hundred ten thousand, two hundred forty-three".