13443421505 has 4 divisors (see below), whose sum is σ = 16132105812. Its totient is φ = 10754737200.

The previous prime is 13443421429. The next prime is 13443421513. The reversal of 13443421505 is 50512434431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50512434431 = 132953 ⋅379927.

It can be written as a sum of positive squares in 2 ways, for example, as 9931318336 + 3512103169 = 99656^2 + 59263^2 .

It is not a de Polignac number, because 13443421505 - 2¹⁸ = 13443159361 is a prime.

It is a super-2 number, since 2×13443421505² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344342146 + ... + 1344342155.

It is an arithmetic number, because the mean of its divisors is an integer number (4033026453).

Almost surely, 2^13443421505 is an apocalyptic number.

It is an amenable number.

13443421505 is a deficient number, since it is larger than the sum of its proper divisors (2688684307).

13443421505 is an equidigital number, since it uses as much as digits as its factorization.

13443421505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2688684306.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 13443421505 its reverse (50512434431), we get a palindrome (63955855936).

The spelling of 13443421505 in words is "thirteen billion, four hundred forty-three million, four hundred twenty-one thousand, five hundred five".