21544331555341 has 16 divisors (see below), whose sum is σ = 24734542170240. Its totient is φ = 18382259378880.

The previous prime is 21544331555333. The next prime is 21544331555447. The reversal of 21544331555341 is 14355513344512.

It is a cyclic number.

It is not a de Polignac number, because 21544331555341 - 2³ = 21544331555333 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21544331555291 and 21544331555300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544331555741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8809551 + ... + 10986211.

It is an arithmetic number, because the mean of its divisors is an integer number (1545908885640).

Almost surely, 2^{21544331555341} is an apocalyptic number.

It is an amenable number.

21544331555341 is a deficient number, since it is larger than the sum of its proper divisors (3190210614899).

21544331555341 is a wasteful number, since it uses less digits than its factorization.

21544331555341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183124.

The product of its digits is 2160000, while the sum is 46.

Adding to 21544331555341 its reverse (14355513344512), we get a palindrome (35899844899853).

The spelling of 21544331555341 in words is "twenty-one trillion, five hundred forty-four billion, three hundred thirty-one million, five hundred fifty-five thousand, three hundred forty-one".