216220365 has 48 divisors (see below), whose sum is σ = 399297600. Its totient is φ = 107859456.

The previous prime is 216220349. The next prime is 216220369. The reversal of 216220365 is 563022612.

216220365 is a `hidden beast` number, since 2 + 1 + 622 + 0 + 36 + 5 = 666.

216220365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216220365 - 2⁴ = 216220349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216220369) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 136146 + ... + 137724.

It is an arithmetic number, because the mean of its divisors is an integer number (8318700).

Almost surely, 2^216220365 is an apocalyptic number.

It is an amenable number.

216220365 is a deficient number, since it is larger than the sum of its proper divisors (183077235).

216220365 is a wasteful number, since it uses less digits than its factorization.

216220365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1786 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 216220365 is about 14704.4335151001. The cubic root of 216220365 is about 600.2039723176.

Adding to 216220365 its reverse (563022612), we get a palindrome (779242977).

The spelling of 216220365 in words is "two hundred sixteen million, two hundred twenty thousand, three hundred sixty-five".