216224317 has 4 divisors (see below), whose sum is σ = 216437116. Its totient is φ = 216011520.

The previous prime is 216224297. The next prime is 216224329. The reversal of 216224317 is 713422612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143736121 + 72488196 = 11989^2 + 8514^2 .

It is a cyclic number.

It is not a de Polignac number, because 216224317 - 2²³ = 207835709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216224347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104868 + ... + 106909.

It is an arithmetic number, because the mean of its divisors is an integer number (54109279).

Almost surely, 2^216224317 is an apocalyptic number.

It is an amenable number.

216224317 is a deficient number, since it is larger than the sum of its proper divisors (212799).

216224317 is a wasteful number, since it uses less digits than its factorization.

216224317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212798.

The product of its digits is 4032, while the sum is 28.

The square root of 216224317 is about 14704.5678957255. The cubic root of 216224317 is about 600.2076290679.

Adding to 216224317 its reverse (713422612), we get a palindrome (929646929).

The spelling of 216224317 in words is "two hundred sixteen million, two hundred twenty-four thousand, three hundred seventeen".