13444320221543 has 4 divisors (see below), whose sum is σ = 13446869879808. Its totient is φ = 13441770563280.

The previous prime is 13444320221539. The next prime is 13444320221617. The reversal of 13444320221543 is 34512202344431.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13444320221543 - 2² = 13444320221539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13444320221497 and 13444320221506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13444320221743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274821223 + ... + 1274831768.

It is an arithmetic number, because the mean of its divisors is an integer number (3361717469952).

Almost surely, 2^{13444320221543} is an apocalyptic number.

13444320221543 is a deficient number, since it is larger than the sum of its proper divisors (2549658265).

13444320221543 is an equidigital number, since it uses as much as digits as its factorization.

13444320221543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549658264.

The product of its (nonzero) digits is 276480, while the sum is 38.

Adding to 13444320221543 its reverse (34512202344431), we get a palindrome (47956522565974).

The spelling of 13444320221543 in words is "thirteen trillion, four hundred forty-four billion, three hundred twenty million, two hundred twenty-one thousand, five hundred forty-three".