217126206241 has 4 divisors (see below), whose sum is σ = 248144235712. Its totient is φ = 186108176772.

The previous prime is 217126206179. The next prime is 217126206247. The reversal of 217126206241 is 142602621712.

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.

It is not a de Polignac number, because 217126206241 - 2²³ = 217117817633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217126206197 and 217126206206.

It is not an unprimeable number, because it can be changed into a prime (217126206247) 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, 15509014725 + ... + 15509014738.

It is an arithmetic number, because the mean of its divisors is an integer number (62036058928).

Almost surely, 2^217126206241 is an apocalyptic number.

It is an amenable number.

217126206241 is a deficient number, since it is larger than the sum of its proper divisors (31018029471).

217126206241 is an equidigital number, since it uses as much as digits as its factorization.

217126206241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31018029470.

The product of its (nonzero) digits is 16128, while the sum is 34.

Adding to 217126206241 its reverse (142602621712), we get a palindrome (359728827953).

The spelling of 217126206241 in words is "two hundred seventeen billion, one hundred twenty-six million, two hundred six thousand, two hundred forty-one".