21544330405041 has 12 divisors (see below), whose sum is σ = 31119660024180. Its totient is φ = 14362853862240.

The previous prime is 21544330405027. The next prime is 21544330405043. The reversal of 21544330405041 is 14050403344512.

21544330405041 is a `hidden beast` number, since 2 + 1 + 544 + 3 + 30 + 40 + 5 + 0 + 41 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18116940960000 + 3427389445041 = 4256400^2 + 1851321^2 .

It is not a de Polignac number, because 21544330405041 - 2¹⁰ = 21544330404017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21544330404987 and 21544330405005.

It is not an unprimeable number, because it can be changed into a prime (21544330405043) 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 11 ways as a sum of consecutive naturals, for example, 1758471 + ... + 6795651.

It is an arithmetic number, because the mean of its divisors is an integer number (2593305002015).

Almost surely, 2^{21544330405041} is an apocalyptic number.

It is an amenable number.

21544330405041 is a deficient number, since it is larger than the sum of its proper divisors (9575329619139).

21544330405041 is a wasteful number, since it uses less digits than its factorization.

21544330405041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512416 (or 5512413 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 21544330405041 its reverse (14050403344512), we get a palindrome (35594733749553).

The spelling of 21544330405041 in words is "twenty-one trillion, five hundred forty-four billion, three hundred thirty million, four hundred five thousand, forty-one".