217085912 has 16 divisors (see below), whose sum is σ = 407319360. Its totient is φ = 108467424.

The previous prime is 217085899. The next prime is 217085927. The reversal of 217085912 is 219580712.

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, 3878 + ... + 21194.

It is an arithmetic number, because the mean of its divisors is an integer number (25457460).

Almost surely, 2^217085912 is an apocalyptic number.

It is an amenable number.

217085912 is a deficient number, since it is larger than the sum of its proper divisors (190233448).

217085912 is a wasteful number, since it uses less digits than its factorization.

217085912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18890 (or 18886 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 217085912 is about 14733.8356173808. The cubic root of 217085912 is about 601.0037938009.

The spelling of 217085912 in words is "two hundred seventeen million, eighty-five thousand, nine hundred twelve".