216522446 has 16 divisors (see below), whose sum is σ = 381214176. Its totient is φ = 90287136.

The previous prime is 216522443. The next prime is 216522463. The reversal of 216522446 is 644225612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216522443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208481 + ... + 209516.

It is an arithmetic number, because the mean of its divisors is an integer number (23825886).

Almost surely, 2^216522446 is an apocalyptic number.

216522446 is a deficient number, since it is larger than the sum of its proper divisors (164691730).

216522446 is a wasteful number, since it uses less digits than its factorization.

216522446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418043.

The product of its digits is 23040, while the sum is 32.

The square root of 216522446 is about 14714.7016959230. The cubic root of 216522446 is about 600.4833568021.

The spelling of 216522446 in words is "two hundred sixteen million, five hundred twenty-two thousand, four hundred forty-six".