216203417808821 has 16 divisors (see below), whose sum is σ = 217243563926400. Its totient is φ = 215166223550208.

The previous prime is 216203417808811. The next prime is 216203417808857. The reversal of 216203417808821 is 128808714302612.

It is a cyclic number.

It is not a de Polignac number, because 216203417808821 - 2³⁰ = 216202344066997 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 (216203417808811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 387667256 + ... + 388224558.

It is an arithmetic number, because the mean of its divisors is an integer number (13577722745400).

Almost surely, 2^{216203417808821} is an apocalyptic number.

It is an amenable number.

216203417808821 is a deficient number, since it is larger than the sum of its proper divisors (1040146117579).

216203417808821 is a wasteful number, since it uses less digits than its factorization.

216203417808821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559948.

The product of its (nonzero) digits is 2064384, while the sum is 53.

The spelling of 216203417808821 in words is "two hundred sixteen trillion, two hundred three billion, four hundred seventeen million, eight hundred eight thousand, eight hundred twenty-one".