216406711 has 4 divisors (see below), whose sum is σ = 219954424. Its totient is φ = 212859000.

The previous prime is 216406703. The next prime is 216406721. The reversal of 216406711 is 117604612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216406711 - 2³ = 216406703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216406711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216406721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1773765 + ... + 1773886.

It is an arithmetic number, because the mean of its divisors is an integer number (54988606).

Almost surely, 2^216406711 is an apocalyptic number.

216406711 is a deficient number, since it is larger than the sum of its proper divisors (3547713).

216406711 is an equidigital number, since it uses as much as digits as its factorization.

216406711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3547712.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 216406711 is about 14710.7685387270. The cubic root of 216406711 is about 600.3763481467.

The spelling of 216406711 in words is "two hundred sixteen million, four hundred six thousand, seven hundred eleven".