216265771 has 4 divisors (see below), whose sum is σ = 227648200. Its totient is φ = 204883344.

The previous prime is 216265769. The next prime is 216265793. The reversal of 216265771 is 177562612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216265771 - 2¹ = 216265769 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 216265771.

It is not an unprimeable number, because it can be changed into a prime (216265741) 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, 5691186 + ... + 5691223.

It is an arithmetic number, because the mean of its divisors is an integer number (56912050).

Almost surely, 2^216265771 is an apocalyptic number.

216265771 is the 8491-st hex number.

216265771 is a deficient number, since it is larger than the sum of its proper divisors (11382429).

216265771 is a wasteful number, since it uses less digits than its factorization.

216265771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11382428.

The product of its digits is 35280, while the sum is 37.

The square root of 216265771 is about 14705.9773901635. The cubic root of 216265771 is about 600.2459833991.

The spelling of 216265771 in words is "two hundred sixteen million, two hundred sixty-five thousand, seven hundred seventy-one".