20117050066821 has 32 divisors (see below), whose sum is σ = 27610134356992. Its totient is φ = 13021535842560.

The previous prime is 20117050066753. The next prime is 20117050066847. The reversal of 20117050066821 is 12866005071102.

It is not a de Polignac number, because 20117050066821 - 2³⁵ = 20082690328453 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20117050066821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20117050066891) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21952221 + ... + 22850253.

It is an arithmetic number, because the mean of its divisors is an integer number (862816698656).

Almost surely, 2^{20117050066821} is an apocalyptic number.

It is an amenable number.

20117050066821 is a deficient number, since it is larger than the sum of its proper divisors (7493084290171).

20117050066821 is a wasteful number, since it uses less digits than its factorization.

20117050066821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899113.

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 20117050066821 in words is "twenty trillion, one hundred seventeen billion, fifty million, sixty-six thousand, eight hundred twenty-one".