216521246 has 8 divisors (see below), whose sum is σ = 332703504. Its totient is φ = 105620080.

The previous prime is 216521233. The next prime is 216521251. The reversal of 216521246 is 642125612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1320170 + ... + 1320333.

It is an arithmetic number, because the mean of its divisors is an integer number (41587938).

Almost surely, 2^216521246 is an apocalyptic number.

216521246 is a deficient number, since it is larger than the sum of its proper divisors (116182258).

216521246 is a wasteful number, since it uses less digits than its factorization.

216521246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640546.

The product of its digits is 5760, while the sum is 29.

The square root of 216521246 is about 14714.6609203203. The cubic root of 216521246 is about 600.4822474770.

Adding to 216521246 its reverse (642125612), we get a palindrome (858646858).

The spelling of 216521246 in words is "two hundred sixteen million, five hundred twenty-one thousand, two hundred forty-six".