217420711 has 2 divisors, whose sum is σ = 217420712. Its totient is φ = 217420710.

The previous prime is 217420669. The next prime is 217420727. The reversal of 217420711 is 117024712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217420711 - 2⁷ = 217420583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217426711) 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, 108710355 + 108710356.

It is an arithmetic number, because the mean of its divisors is an integer number (108710356).

Almost surely, 2^217420711 is an apocalyptic number.

217420711 is a deficient number, since it is larger than the sum of its proper divisors (1).

217420711 is an equidigital number, since it uses as much as digits as its factorization.

217420711 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 217420711 is about 14745.1928098618. The cubic root of 217420711 is about 601.3125995250.

The spelling of 217420711 in words is "two hundred seventeen million, four hundred twenty thousand, seven hundred eleven".