216688228821 has 12 divisors (see below), whose sum is σ = 313499761120. Its totient is φ = 144225441000.

The previous prime is 216688228807. The next prime is 216688228853. The reversal of 216688228821 is 128822886612.

It is not a de Polignac number, because 216688228821 - 2⁵ = 216688228789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216688228871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19442305 + ... + 19453446.

Almost surely, 2^216688228821 is an apocalyptic number.

It is an amenable number.

216688228821 is a deficient number, since it is larger than the sum of its proper divisors (96811532299).

216688228821 is a wasteful number, since it uses less digits than its factorization.

216688228821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38896376 (or 38896373 counting only the distinct ones).

The product of its digits is 2359296, while the sum is 54.

The spelling of 216688228821 in words is "two hundred sixteen billion, six hundred eighty-eight million, two hundred twenty-eight thousand, eight hundred twenty-one".