216243106 has 16 divisors (see below), whose sum is σ = 326719224. Its totient is φ = 107339904.

The previous prime is 216243091. The next prime is 216243149. The reversal of 216243106 is 601342612.

It can be written as a sum of positive squares in 4 ways, for example, as 92833225 + 123409881 = 9635^2 + 11109^2 .

It is a super-2 number, since 2×216243106² = 93522161785054472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285280 + ... + 286036.

Almost surely, 2^216243106 is an apocalyptic number.

216243106 is a deficient number, since it is larger than the sum of its proper divisors (110476118).

216243106 is a wasteful number, since it uses less digits than its factorization.

216243106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1605.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 216243106 is about 14705.2067649523. The cubic root of 216243106 is about 600.2250137523.

Adding to 216243106 its reverse (601342612), we get a palindrome (817585718).

The spelling of 216243106 in words is "two hundred sixteen million, two hundred forty-three thousand, one hundred six".