216571612028 has 12 divisors (see below), whose sum is σ = 379097802720. Its totient is φ = 108257954112.

The previous prime is 216571611947. The next prime is 216571612039. The reversal of 216571612028 is 820216175612.

It is a congruent number.

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, 6945476 + ... + 6976587.

It is an arithmetic number, because the mean of its divisors is an integer number (31591483560).

Almost surely, 2^216571612028 is an apocalyptic number.

It is an amenable number.

216571612028 is a deficient number, since it is larger than the sum of its proper divisors (162526190692).

216571612028 is a wasteful number, since it uses less digits than its factorization.

216571612028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13925956 (or 13925954 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 216571612028 in words is "two hundred sixteen billion, five hundred seventy-one million, six hundred twelve thousand, twenty-eight".