21544330405043 has 2 divisors, whose sum is σ = 21544330405044. Its totient is φ = 21544330405042.

The previous prime is 21544330405027. The next prime is 21544330405061. The reversal of 21544330405043 is 34050403344512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21544330405043 - 2⁴ = 21544330405027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21544330404988 and 21544330405006.

It is not a weakly prime, because it can be changed into another prime (21544330405243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772165202521 + 10772165202522.

It is an arithmetic number, because the mean of its divisors is an integer number (10772165202522).

Almost surely, 2^{21544330405043} is an apocalyptic number.

21544330405043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21544330405043 is an equidigital number, since it uses as much as digits as its factorization.

21544330405043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 38.

Adding to 21544330405043 its reverse (34050403344512), we get a palindrome (55594733749555).

The spelling of 21544330405043 in words is "twenty-one trillion, five hundred forty-four billion, three hundred thirty million, four hundred five thousand, forty-three".