13530340521 has 20 divisors (see below), whose sum is σ = 20543341764. Its totient is φ = 8872351200.

The previous prime is 13530340517. The next prime is 13530340529. The reversal of 13530340521 is 12504303531.

13530340521 is a `hidden beast` number, since 135 + 3 + 0 + 3 + 4 + 0 + 521 = 666.

13530340521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3422250000 + 10108090521 = 58500^2 + 100539^2 .

It is not a de Polignac number, because 13530340521 - 2² = 13530340517 is a prime.

It is a super-2 number, since 2×13530340521² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (13530340529) 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 19 ways as a sum of consecutive naturals, for example, 1364250 + ... + 1374131.

Almost surely, 2^13530340521 is an apocalyptic number.

It is an amenable number.

13530340521 is a deficient number, since it is larger than the sum of its proper divisors (7013001243).

13530340521 is an equidigital number, since it uses as much as digits as its factorization.

13530340521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738454 (or 2738445 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The spelling of 13530340521 in words is "thirteen billion, five hundred thirty million, three hundred forty thousand, five hundred twenty-one".