216820223 has 2 divisors, whose sum is σ = 216820224. Its totient is φ = 216820222.

The previous prime is 216820217. The next prime is 216820237. The reversal of 216820223 is 322028612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216820223 - 2⁴ = 216820207 is a prime.

It is a super-2 number, since 2×216820223² = 94022018203539458, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 216820192 and 216820201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216820213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108410111 + 108410112.

It is an arithmetic number, because the mean of its divisors is an integer number (108410112).

Almost surely, 2^216820223 is an apocalyptic number.

216820223 is a deficient number, since it is larger than the sum of its proper divisors (1).

216820223 is an equidigital number, since it uses as much as digits as its factorization.

216820223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 216820223 is about 14724.8165693159. The cubic root of 216820223 is about 600.7585064499.

Adding to 216820223 its reverse (322028612), we get a palindrome (538848835).

The spelling of 216820223 in words is "two hundred sixteen million, eight hundred twenty thousand, two hundred twenty-three".