216922337 has 2 divisors, whose sum is σ = 216922338. Its totient is φ = 216922336.

The previous prime is 216922331. The next prime is 216922339. The reversal of 216922337 is 733229612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197571136 + 19351201 = 14056^2 + 4399^2 .

It is a cyclic number.

It is not a de Polignac number, because 216922337 - 2¹⁸ = 216660193 is a prime.

Together with 216922339, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 216922297 and 216922306.

It is not a weakly prime, because it can be changed into another prime (216922331) by changing a digit.

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 as a sum of consecutive naturals, namely, 108461168 + 108461169.

It is an arithmetic number, because the mean of its divisors is an integer number (108461169).

Almost surely, 2^216922337 is an apocalyptic number.

It is an amenable number.

216922337 is a deficient number, since it is larger than the sum of its proper divisors (1).

216922337 is an equidigital number, since it uses as much as digits as its factorization.

216922337 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 216922337 is about 14728.2835727725. The cubic root of 216922337 is about 600.8528030447.

The spelling of 216922337 in words is "two hundred sixteen million, nine hundred twenty-two thousand, three hundred thirty-seven".