213242313 has 4 divisors (see below), whose sum is σ = 284323088. Its totient is φ = 142161540.

The previous prime is 213242291. The next prime is 213242329. The reversal of 213242313 is 313242312.

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 not a de Polignac number, because 213242313 - 2²² = 209048009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213242313.

It is not an unprimeable number, because it can be changed into a prime (213242363) 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, 35540383 + ... + 35540388.

It is an arithmetic number, because the mean of its divisors is an integer number (71080772).

Almost surely, 2^213242313 is an apocalyptic number.

It is an amenable number.

213242313 is a deficient number, since it is larger than the sum of its proper divisors (71080775).

213242313 is an equidigital number, since it uses as much as digits as its factorization.

213242313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71080774.

The product of its digits is 864, while the sum is 21.

The square root of 213242313 is about 14602.8186662712. The cubic root of 213242313 is about 597.4356418371.

Adding to 213242313 its reverse (313242312), we get a palindrome (526484625).

Subtracting 213242313 from its reverse (313242312), we obtain a palindrome (99999999).

The spelling of 213242313 in words is "two hundred thirteen million, two hundred forty-two thousand, three hundred thirteen".