217317792123 has 12 divisors (see below), whose sum is σ = 313918568808. Its totient is φ = 144871562880.

The previous prime is 217317792119. The next prime is 217317792137. The reversal of 217317792123 is 321297713712.

It is not a de Polignac number, because 217317792123 - 2² = 217317792119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217317792113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 379158 + ... + 760523.

It is an arithmetic number, because the mean of its divisors is an integer number (26159880734).

Almost surely, 2^217317792123 is an apocalyptic number.

217317792123 is a deficient number, since it is larger than the sum of its proper divisors (96600776685).

217317792123 is a wasteful number, since it uses less digits than its factorization.

217317792123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1160874 (or 1160871 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The spelling of 217317792123 in words is "two hundred seventeen billion, three hundred seventeen million, seven hundred ninety-two thousand, one hundred twenty-three".