217021671716 has 12 divisors (see below), whose sum is σ = 379806733488. Its totient is φ = 108505462152.

The previous prime is 217021671707. The next prime is 217021671799. The reversal of 217021671716 is 617176120712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1251866 + ... + 1414641.

It is an arithmetic number, because the mean of its divisors is an integer number (31650561124).

Almost surely, 2^217021671716 is an apocalyptic number.

It is an amenable number.

217021671716 is a deficient number, since it is larger than the sum of its proper divisors (162785061772).

217021671716 is a wasteful number, since it uses less digits than its factorization.

217021671716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686858 (or 2686856 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 41.

The spelling of 217021671716 in words is "two hundred seventeen billion, twenty-one million, six hundred seventy-one thousand, seven hundred sixteen".