217120223 has 2 divisors, whose sum is σ = 217120224. Its totient is φ = 217120222.

The previous prime is 217120219. The next prime is 217120259. The reversal of 217120223 is 322021712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217120223 - 2² = 217120219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217120195 and 217120204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217120723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108560111 + 108560112.

It is an arithmetic number, because the mean of its divisors is an integer number (108560112).

Almost surely, 2^217120223 is an apocalyptic number.

217120223 is a deficient number, since it is larger than the sum of its proper divisors (1).

217120223 is an equidigital number, since it uses as much as digits as its factorization.

217120223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 217120223 is about 14734.9999321344. Note that the first 4 decimals coincide. The cubic root of 217120223 is about 601.0354555436.

Adding to 217120223 its reverse (322021712), we get a palindrome (539141935).

The spelling of 217120223 in words is "two hundred seventeen million, one hundred twenty thousand, two hundred twenty-three".