13405721005 has 16 divisors (see below), whose sum is σ = 17195721984. Its totient is φ = 10008085120.

The previous prime is 13405720969. The next prime is 13405721023. The reversal of 13405721005 is 50012750431.

It is a happy number.

13405721005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13405721005 - 2¹³ = 13405712813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1416889 + ... + 1426318.

It is an arithmetic number, because the mean of its divisors is an integer number (1074732624).

Almost surely, 2^13405721005 is an apocalyptic number.

It is an amenable number.

13405721005 is a deficient number, since it is larger than the sum of its proper divisors (3790000979).

13405721005 is a wasteful number, since it uses less digits than its factorization.

13405721005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2843276.

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 13405721005 in words is "thirteen billion, four hundred five million, seven hundred twenty-one thousand, five".