13155015421 has 4 divisors (see below), whose sum is σ = 13159055200. Its totient is φ = 13150975644.

The previous prime is 13155015403. The next prime is 13155015431. The reversal of 13155015421 is 12451055131.

13155015421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12451055131 = 22727 ⋅547853.

It is a cyclic number.

It is not a de Polignac number, because 13155015421 - 2²⁹ = 12618144509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13155015421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13155015431) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2015001 + ... + 2021518.

It is an arithmetic number, because the mean of its divisors is an integer number (3289763800).

Almost surely, 2^13155015421 is an apocalyptic number.

It is an amenable number.

13155015421 is a deficient number, since it is larger than the sum of its proper divisors (4039779).

13155015421 is an equidigital number, since it uses as much as digits as its factorization.

13155015421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039778.

The product of its (nonzero) digits is 3000, while the sum is 28.

The spelling of 13155015421 in words is "thirteen billion, one hundred fifty-five million, fifteen thousand, four hundred twenty-one".