17921734304389 has 4 divisors (see below), whose sum is σ = 17933084359360. Its totient is φ = 17910384249420.

The previous prime is 17921734304351. The next prime is 17921734304443. The reversal of 17921734304389 is 98340343712971.

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 17921734304389 - 2⁷ = 17921734304261 is a prime.

It is a super-2 number, since 2×17921734304389² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17921734304329) 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, 5675025117 + ... + 5675028274.

It is an arithmetic number, because the mean of its divisors is an integer number (4483271089840).

Almost surely, 2^{17921734304389} is an apocalyptic number.

It is an amenable number.

17921734304389 is a deficient number, since it is larger than the sum of its proper divisors (11350054971).

17921734304389 is a wasteful number, since it uses less digits than its factorization.

17921734304389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11350054970.

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 17921734304389 in words is "seventeen trillion, nine hundred twenty-one billion, seven hundred thirty-four million, three hundred four thousand, three hundred eighty-nine".