100505211717 has 4 divisors (see below), whose sum is σ = 134006948960. Its totient is φ = 67003474476.

The previous prime is 100505211679. The next prime is 100505211721. The reversal of 100505211717 is 717112505001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 717112505001 = 3 ⋅239037501667.

It is not a de Polignac number, because 100505211717 - 2⁷ = 100505211589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100505211017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16750868617 + ... + 16750868622.

It is an arithmetic number, because the mean of its divisors is an integer number (33501737240).

Almost surely, 2^100505211717 is an apocalyptic number.

It is an amenable number.

100505211717 is a deficient number, since it is larger than the sum of its proper divisors (33501737243).

100505211717 is an equidigital number, since it uses as much as digits as its factorization.

100505211717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33501737242.

The product of its (nonzero) digits is 2450, while the sum is 30.

Adding to 100505211717 its reverse (717112505001), we get a palindrome (817617716718).

The spelling of 100505211717 in words is "one hundred billion, five hundred five million, two hundred eleven thousand, seven hundred seventeen".