217020343 has 2 divisors, whose sum is σ = 217020344. Its totient is φ = 217020342.

The previous prime is 217020329. The next prime is 217020361. The reversal of 217020343 is 343020712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 217020343 - 2²⁵ = 183465911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217020443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108510171 + 108510172.

It is an arithmetic number, because the mean of its divisors is an integer number (108510172).

Almost surely, 2^217020343 is an apocalyptic number.

217020343 is a deficient number, since it is larger than the sum of its proper divisors (1).

217020343 is an equidigital number, since it uses as much as digits as its factorization.

217020343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 217020343 is about 14731.6103328862. The cubic root of 217020343 is about 600.9432783033.

The spelling of 217020343 in words is "two hundred seventeen million, twenty thousand, three hundred forty-three".