21168104568445 has 8 divisors (see below), whose sum is σ = 25420226382936. Its totient is φ = 16922149720896.

The previous prime is 21168104568431. The next prime is 21168104568467. The reversal of 21168104568445 is 54486540186112.

It can be written as a sum of positive squares in 4 ways, for example, as 2330794569636 + 18837309998809 = 1526694^2 + 4340197^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21168104568445 - 2⁹ = 21168104567933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1541734182 + ... + 1541747911.

It is an arithmetic number, because the mean of its divisors is an integer number (3177528297867).

Almost surely, 2^{21168104568445} is an apocalyptic number.

It is an amenable number.

21168104568445 is a deficient number, since it is larger than the sum of its proper divisors (4252121814491).

21168104568445 is a wasteful number, since it uses less digits than its factorization.

21168104568445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3083483471.

The product of its (nonzero) digits is 7372800, while the sum is 55.

The spelling of 21168104568445 in words is "twenty-one trillion, one hundred sixty-eight billion, one hundred four million, five hundred sixty-eight thousand, four hundred forty-five".