21017240120763 has 8 divisors (see below), whose sum is σ = 31136652030800. Its totient is φ = 14011493413824.

The previous prime is 21017240120759. The next prime is 21017240120801. The reversal of 21017240120763 is 36702104271012.

21017240120763 is a `hidden beast` number, since 2 + 1 + 0 + 172 + 401 + 20 + 7 + 63 = 666.

It is not a de Polignac number, because 21017240120763 - 2² = 21017240120759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21017240120263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389208150358 + ... + 389208150411.

It is an arithmetic number, because the mean of its divisors is an integer number (3892081503850).

Almost surely, 2^{21017240120763} is an apocalyptic number.

21017240120763 is a deficient number, since it is larger than the sum of its proper divisors (10119411910037).

21017240120763 is an equidigital number, since it uses as much as digits as its factorization.

21017240120763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778416300778 (or 778416300772 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

Adding to 21017240120763 its reverse (36702104271012), we get a palindrome (57719344391775).

The spelling of 21017240120763 in words is "twenty-one trillion, seventeen billion, two hundred forty million, one hundred twenty thousand, seven hundred sixty-three".