217138346684 has 48 divisors (see below), whose sum is σ = 472896614400. Its totient is φ = 85121378496.

The previous prime is 217138346669. The next prime is 217138346743. The reversal of 217138346684 is 486643831712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7021724 + ... + 7052579.

It is an arithmetic number, because the mean of its divisors is an integer number (9852012800).

Almost surely, 2^217138346684 is an apocalyptic number.

It is an amenable number.

217138346684 is an abundant number, since it is smaller than the sum of its proper divisors (255758267716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217138346684 is a wasteful number, since it uses less digits than its factorization.

217138346684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14074362 (or 14074360 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 53.

The spelling of 217138346684 in words is "two hundred seventeen billion, one hundred thirty-eight million, three hundred forty-six thousand, six hundred eighty-four".