13481927821 has 4 divisors (see below), whose sum is σ = 13494980092. Its totient is φ = 13468875552.

The previous prime is 13481927803. The next prime is 13481927857. The reversal of 13481927821 is 12872918431.

13481927821 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.

It can be written as a sum of positive squares in 2 ways, for example, as 5865874921 + 7616052900 = 76589^2 + 87270^2 .

It is a cyclic number.

It is not a de Polignac number, because 13481927821 - 2³³ = 4891993229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13481927861) 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, 6524586 + ... + 6526651.

It is an arithmetic number, because the mean of its divisors is an integer number (3373745023).

Almost surely, 2^13481927821 is an apocalyptic number.

It is an amenable number.

13481927821 is a deficient number, since it is larger than the sum of its proper divisors (13052271).

13481927821 is a wasteful number, since it uses less digits than its factorization.

13481927821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13052270.

The product of its digits is 193536, while the sum is 46.

The spelling of 13481927821 in words is "thirteen billion, four hundred eighty-one million, nine hundred twenty-seven thousand, eight hundred twenty-one".