13105442544521 has 2 divisors, whose sum is σ = 13105442544522. Its totient is φ = 13105442544520.

The previous prime is 13105442544517. The next prime is 13105442544589. The reversal of 13105442544521 is 12544524450131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12385922964496 + 719519580025 = 3519364^2 + 848245^2 .

It is a cyclic number.

It is not a de Polignac number, because 13105442544521 - 2² = 13105442544517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13105442544721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6552721272260 + 6552721272261.

It is an arithmetic number, because the mean of its divisors is an integer number (6552721272261).

Almost surely, 2^{13105442544521} is an apocalyptic number.

It is an amenable number.

13105442544521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13105442544521 is an equidigital number, since it uses as much as digits as its factorization.

13105442544521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 13105442544521 its reverse (12544524450131), we get a palindrome (25649966994652).

The spelling of 13105442544521 in words is "thirteen trillion, one hundred five billion, four hundred forty-two million, five hundred forty-four thousand, five hundred twenty-one".