21726685104481 has 8 divisors (see below), whose sum is σ = 24830551871360. Its totient is φ = 18622831989888.

The previous prime is 21726685104427. The next prime is 21726685104491. The reversal of 21726685104481 is 18440158662712.

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

It is a de Polignac number, because none of the positive numbers 2^k-21726685104481 is a prime.

It is a super-2 number, since 2×21726685104481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21726685104491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 260785 + ... + 6597073.

It is an arithmetic number, because the mean of its divisors is an integer number (3103818983920).

Almost surely, 2^{21726685104481} is an apocalyptic number.

It is an amenable number.

21726685104481 is a deficient number, since it is larger than the sum of its proper divisors (3103866766879).

21726685104481 is an equidigital number, since it uses as much as digits as its factorization.

21726685104481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826143.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 21726685104481 in words is "twenty-one trillion, seven hundred twenty-six billion, six hundred eighty-five million, one hundred four thousand, four hundred eighty-one".