213118305 has 16 divisors (see below), whose sum is σ = 341397504. Its totient is φ = 113527040.

The previous prime is 213118289. The next prime is 213118313. The reversal of 213118305 is 503811312.

It is not a de Polignac number, because 213118305 - 2⁴ = 213118289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5152 + ... + 21278.

It is an arithmetic number, because the mean of its divisors is an integer number (21337344).

Almost surely, 2^213118305 is an apocalyptic number.

It is an amenable number.

213118305 is a deficient number, since it is larger than the sum of its proper divisors (128279199).

213118305 is a wasteful number, since it uses less digits than its factorization.

213118305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17016.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 213118305 is about 14598.5720192079. The cubic root of 213118305 is about 597.3198093458.

Adding to 213118305 its reverse (503811312), we get a palindrome (716929617).

The spelling of 213118305 in words is "two hundred thirteen million, one hundred eighteen thousand, three hundred five".