17040665221 has 4 divisors (see below), whose sum is σ = 17456291244. Its totient is φ = 16625039200.

The previous prime is 17040665209. The next prime is 17040665227. The reversal of 17040665221 is 12256604071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12256604071 = 97 ⋅126356743.

It can be written as a sum of positive squares in 2 ways, for example, as 7307856196 + 9732809025 = 85486^2 + 98655^2 .

It is a cyclic number.

It is not a de Polignac number, because 17040665221 - 2⁹ = 17040664709 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 (17040665227) 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, 207812950 + ... + 207813031.

It is an arithmetic number, because the mean of its divisors is an integer number (4364072811).

Almost surely, 2^17040665221 is an apocalyptic number.

It is an amenable number.

17040665221 is a deficient number, since it is larger than the sum of its proper divisors (415626023).

17040665221 is an equidigital number, since it uses as much as digits as its factorization.

17040665221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415626022.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 17040665221 in words is "seventeen billion, forty million, six hundred sixty-five thousand, two hundred twenty-one".