17044991921 has 2 divisors, whose sum is σ = 17044991922. Its totient is φ = 17044991920.

The previous prime is 17044991867. The next prime is 17044991963. The reversal of 17044991921 is 12919944071.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10142705521 + 6902286400 = 100711^2 + 83080^2 .

It is an emirp because it is prime and its reverse (12919944071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17044991921 - 2¹⁴ = 17044975537 is a prime.

It is a super-3 number, since 3×17044991921³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (17044991221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8522495960 + 8522495961.

It is an arithmetic number, because the mean of its divisors is an integer number (8522495961).

Almost surely, 2^17044991921 is an apocalyptic number.

It is an amenable number.

17044991921 is a deficient number, since it is larger than the sum of its proper divisors (1).

17044991921 is an equidigital number, since it uses as much as digits as its factorization.

17044991921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 47.

The spelling of 17044991921 in words is "seventeen billion, forty-four million, nine hundred ninety-one thousand, nine hundred twenty-one".