217372223 has 2 divisors, whose sum is σ = 217372224. Its totient is φ = 217372222.

The previous prime is 217372157. The next prime is 217372237. The reversal of 217372223 is 322273712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217372223 - 2¹⁰ = 217371199 is a prime.

It is a super-5 number, since 5×217372223⁵ (a number of 43 digits) contains 55555 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217371223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108686111 + 108686112.

It is an arithmetic number, because the mean of its divisors is an integer number (108686112).

Almost surely, 2^217372223 is an apocalyptic number.

217372223 is a deficient number, since it is larger than the sum of its proper divisors (1).

217372223 is an equidigital number, since it uses as much as digits as its factorization.

217372223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 29.

The square root of 217372223 is about 14743.5485213025. The cubic root of 217372223 is about 601.2678956988.

The spelling of 217372223 in words is "two hundred seventeen million, three hundred seventy-two thousand, two hundred twenty-three".