2017896317221 has 4 divisors (see below), whose sum is σ = 2018207199744. Its totient is φ = 2017585434700.

The previous prime is 2017896317189. The next prime is 2017896317237. The reversal of 2017896317221 is 1227136987102.

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 a cyclic number.

It is not a de Polignac number, because 2017896317221 - 2⁵ = 2017896317189 is a prime.

It is a super-2 number, since 2×2017896317221² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2017896317291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155431525 + ... + 155444506.

It is an arithmetic number, because the mean of its divisors is an integer number (504551799936).

Almost surely, 2^{2017896317221} is an apocalyptic number.

It is an amenable number.

2017896317221 is a deficient number, since it is larger than the sum of its proper divisors (310882523).

2017896317221 is an equidigital number, since it uses as much as digits as its factorization.

2017896317221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310882522.

The product of its (nonzero) digits is 508032, while the sum is 49.

The spelling of 2017896317221 in words is "two trillion, seventeen billion, eight hundred ninety-six million, three hundred seventeen thousand, two hundred twenty-one".