216342353 has 2 divisors, whose sum is σ = 216342354. Its totient is φ = 216342352.

The previous prime is 216342319. The next prime is 216342419. The reversal of 216342353 is 353243612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128414224 + 87928129 = 11332^2 + 9377^2 .

It is a cyclic number.

It is not a de Polignac number, because 216342353 - 2¹² = 216338257 is a prime.

It is not a weakly prime, because it can be changed into another prime (216362353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108171176 + 108171177.

It is an arithmetic number, because the mean of its divisors is an integer number (108171177).

Almost surely, 2^216342353 is an apocalyptic number.

It is an amenable number.

216342353 is a deficient number, since it is larger than the sum of its proper divisors (1).

216342353 is an equidigital number, since it uses as much as digits as its factorization.

216342353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 29.

The square root of 216342353 is about 14708.5809308716. The cubic root of 216342353 is about 600.3168261910.

Adding to 216342353 its reverse (353243612), we get a palindrome (569585965).

The spelling of 216342353 in words is "two hundred sixteen million, three hundred forty-two thousand, three hundred fifty-three".