13388424721 has 4 divisors (see below), whose sum is σ = 15301056832. Its totient is φ = 11475792612.

The previous prime is 13388424719. The next prime is 13388424733. The reversal of 13388424721 is 12742488331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13388424721 - 2¹ = 13388424719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13388424781) by changing a digit.

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, 956316045 + ... + 956316058.

It is an arithmetic number, because the mean of its divisors is an integer number (3825264208).

Almost surely, 2^13388424721 is an apocalyptic number.

It is an amenable number.

13388424721 is a deficient number, since it is larger than the sum of its proper divisors (1912632111).

13388424721 is an equidigital number, since it uses as much as digits as its factorization.

13388424721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1912632110.

The product of its digits is 258048, while the sum is 43.

The spelling of 13388424721 in words is "thirteen billion, three hundred eighty-eight million, four hundred twenty-four thousand, seven hundred twenty-one".