216265305213 has 64 divisors (see below), whose sum is σ = 335081349120. Its totient is φ = 137732990976.

The previous prime is 216265305209. The next prime is 216265305233. The reversal of 216265305213 is 312503562612.

216265305213 is a `hidden beast` number, since 2 + 1 + 62 + 6 + 530 + 52 + 13 = 666.

It is not a de Polignac number, because 216265305213 - 2² = 216265305209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216265305233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12297895 + ... + 12315467.

It is an arithmetic number, because the mean of its divisors is an integer number (5235646080).

Almost surely, 2^216265305213 is an apocalyptic number.

It is an amenable number.

216265305213 is a deficient number, since it is larger than the sum of its proper divisors (118816043907).

216265305213 is a wasteful number, since it uses less digits than its factorization.

216265305213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17843 (or 17837 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 216265305213 its reverse (312503562612), we get a palindrome (528768867825).

The spelling of 216265305213 in words is "two hundred sixteen billion, two hundred sixty-five million, three hundred five thousand, two hundred thirteen".