217340123 has 32 divisors (see below), whose sum is σ = 301916160. Its totient is φ = 150917760.

The previous prime is 217340119. The next prime is 217340141. The reversal of 217340123 is 321043712.

It is not a de Polignac number, because 217340123 - 2² = 217340119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217340113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25286 + ... + 32772.

It is an arithmetic number, because the mean of its divisors is an integer number (9434880).

Almost surely, 2^217340123 is an apocalyptic number.

217340123 is a deficient number, since it is larger than the sum of its proper divisors (84576037).

217340123 is a wasteful number, since it uses less digits than its factorization.

217340123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7547.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 217340123 is about 14742.4598693705. The cubic root of 217340123 is about 601.2382972381.

Adding to 217340123 its reverse (321043712), we get a palindrome (538383835).

The spelling of 217340123 in words is "two hundred seventeen million, three hundred forty thousand, one hundred twenty-three".