216530236 has 72 divisors (see below), whose sum is σ = 428878800. Its totient is φ = 95546880.

The previous prime is 216530233. The next prime is 216530239. The reversal of 216530236 is 632035612.

It is an interprime number because it is at equal distance from previous prime (216530233) and next prime (216530239).

It is a super-3 number, since 3×216530236³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216530233) 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 23 ways as a sum of consecutive naturals, for example, 2432880 + ... + 2432968.

It is an arithmetic number, because the mean of its divisors is an integer number (5956650).

Almost surely, 2^216530236 is an apocalyptic number.

216530236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

216530236 is a deficient number, since it is larger than the sum of its proper divisors (212348564).

216530236 is a wasteful number, since it uses less digits than its factorization.

216530236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 224 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 216530236 is about 14714.9663947968. The cubic root of 216530236 is about 600.4905580713.

Adding to 216530236 its reverse (632035612), we get a palindrome (848565848).

The spelling of 216530236 in words is "two hundred sixteen million, five hundred thirty thousand, two hundred thirty-six".