216522315 has 40 divisors (see below), whose sum is σ = 392562720. Its totient is φ = 114162048.

The previous prime is 216522301. The next prime is 216522343. The reversal of 216522315 is 513225612.

It is a happy number.

216522315 is a `hidden beast` number, since 2 + 1 + 652 + 2 + 3 + 1 + 5 = 666.

It is not a de Polignac number, because 216522315 - 2⁵ = 216522283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33042 + ... + 39048.

It is an arithmetic number, because the mean of its divisors is an integer number (9814068).

Almost surely, 2^216522315 is an apocalyptic number.

216522315 is a deficient number, since it is larger than the sum of its proper divisors (176040405).

216522315 is an equidigital number, since it uses as much as digits as its factorization.

216522315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6113 (or 6104 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 216522315 is about 14714.6972445919. The cubic root of 216522315 is about 600.4832357009.

Adding to 216522315 its reverse (513225612), we get a palindrome (729747927).

The spelling of 216522315 in words is "two hundred sixteen million, five hundred twenty-two thousand, three hundred fifteen".