216556322 has 16 divisors (see below), whose sum is σ = 329088312. Its totient is φ = 106867200.

The previous prime is 216556321. The next prime is 216556343. The reversal of 216556322 is 223655612.

It can be written as a sum of positive squares in 4 ways, for example, as 216119401 + 436921 = 14701^2 + 661^2 .

It is not an unprimeable number, because it can be changed into a prime (216556321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69788 + ... + 72824.

Almost surely, 2^216556322 is an apocalyptic number.

216556322 is a deficient number, since it is larger than the sum of its proper divisors (112531990).

216556322 is a wasteful number, since it uses less digits than its factorization.

216556322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3493.

The product of its digits is 21600, while the sum is 32.

The square root of 216556322 is about 14715.8527445745. The cubic root of 216556322 is about 600.5146713591.

The spelling of 216556322 in words is "two hundred sixteen million, five hundred fifty-six thousand, three hundred twenty-two".