217930383212 has 6 divisors (see below), whose sum is σ = 381378170628. Its totient is φ = 108965191604.

The previous prime is 217930383197. The next prime is 217930383217. The reversal of 217930383212 is 212383039712.

It is a self number, because there is not a number n which added to its sum of digits gives 217930383212.

It is not an unprimeable number, because it can be changed into a prime (217930383217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27241297898 + ... + 27241297905.

It is an arithmetic number, because the mean of its divisors is an integer number (63563028438).

Almost surely, 2^217930383212 is an apocalyptic number.

It is an amenable number.

217930383212 is a deficient number, since it is larger than the sum of its proper divisors (163447787416).

217930383212 is a wasteful number, since it uses less digits than its factorization.

217930383212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54482595807 (or 54482595805 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 217930383212 in words is "two hundred seventeen billion, nine hundred thirty million, three hundred eighty-three thousand, two hundred twelve".