21440868175673 has 4 divisors (see below), whose sum is σ = 21440882791668. Its totient is φ = 21440853559680.

The previous prime is 21440868175663. The next prime is 21440868175697. The reversal of 21440868175673 is 37657186804412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17656022436649 + 3784845739024 = 4201907^2 + 1945468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21440868175673 - 2³⁸ = 21165990268729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21440868175613) 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, 4826768 + ... + 8135073.

It is an arithmetic number, because the mean of its divisors is an integer number (5360220697917).

Almost surely, 2^{21440868175673} is an apocalyptic number.

It is an amenable number.

21440868175673 is a deficient number, since it is larger than the sum of its proper divisors (14615995).

21440868175673 is a wasteful number, since it uses less digits than its factorization.

21440868175673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14615994.

The product of its (nonzero) digits is 54190080, while the sum is 62.

The spelling of 21440868175673 in words is "twenty-one trillion, four hundred forty billion, eight hundred sixty-eight million, one hundred seventy-five thousand, six hundred seventy-three".