13405243431321 has 48 divisors (see below), whose sum is σ = 23092185542400. Its totient is φ = 7326851051520.

The previous prime is 13405243431317. The next prime is 13405243431397. The reversal of 13405243431321 is 12313434250431.

13405243431321 is a `hidden beast` number, since 1 + 3 + 40 + 52 + 434 + 3 + 132 + 1 = 666.

It is not a de Polignac number, because 13405243431321 - 2² = 13405243431317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13405243439321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50177505 + ... + 50443953.

It is an arithmetic number, because the mean of its divisors is an integer number (481087198800).

Almost surely, 2^{13405243431321} is an apocalyptic number.

It is an amenable number.

13405243431321 is a deficient number, since it is larger than the sum of its proper divisors (9686942111079).

13405243431321 is a wasteful number, since it uses less digits than its factorization.

13405243431321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301206 (or 301203 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 13405243431321 its reverse (12313434250431), we get a palindrome (25718677681752).

The spelling of 13405243431321 in words is "thirteen trillion, four hundred five billion, two hundred forty-three million, four hundred thirty-one thousand, three hundred twenty-one".