216206356 has 12 divisors (see below), whose sum is σ = 378520660. Its totient is φ = 108057600.

The previous prime is 216206327. The next prime is 216206359. The reversal of 216206356 is 653602612.

It can be written as a sum of positive squares in 2 ways, for example, as 33524100 + 182682256 = 5790^2 + 13516^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216206359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706 + ... + 20806.

Almost surely, 2^216206356 is an apocalyptic number.

It is an amenable number.

216206356 is a deficient number, since it is larger than the sum of its proper divisors (162314304).

216206356 is a wasteful number, since it uses less digits than its factorization.

216206356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22794 (or 22792 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 216206356 is about 14703.9571544534. The cubic root of 216206356 is about 600.1910095562.

Adding to 216206356 its reverse (653602612), we get a palindrome (869808968).

The spelling of 216206356 in words is "two hundred sixteen million, two hundred six thousand, three hundred fifty-six".