216212237 has 2 divisors, whose sum is σ = 216212238. Its totient is φ = 216212236.

The previous prime is 216212231. The next prime is 216212251. The reversal of 216212237 is 732212612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110965156 + 105247081 = 10534^2 + 10259^2 .

It is a cyclic number.

It is not a de Polignac number, because 216212237 - 2⁴ = 216212221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216212231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108106118 + 108106119.

It is an arithmetic number, because the mean of its divisors is an integer number (108106119).

Almost surely, 2^216212237 is an apocalyptic number.

It is an amenable number.

216212237 is a deficient number, since it is larger than the sum of its proper divisors (1).

216212237 is an equidigital number, since it uses as much as digits as its factorization.

216212237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 216212237 is about 14704.1571332736. The cubic root of 216212237 is about 600.1964514118.

Adding to 216212237 its reverse (732212612), we get a palindrome (948424849).

The spelling of 216212237 in words is "two hundred sixteen million, two hundred twelve thousand, two hundred thirty-seven".