13520540324421 has 12 divisors (see below), whose sum is σ = 21031951615948. Its totient is φ = 8320332507264.

The previous prime is 13520540324413. The next prime is 13520540324539. The reversal of 13520540324421 is 12442304502531.

It is a happy number.

13520540324421 is a `hidden beast` number, since 1 + 3 + 5 + 2 + 0 + 5 + 403 + 244 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1494286208100 + 12026254116321 = 1222410^2 + 3467889^2 .

It is not a de Polignac number, because 13520540324421 - 2³ = 13520540324413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13520540324321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57780086740 + ... + 57780086973.

Almost surely, 2^{13520540324421} is an apocalyptic number.

It is an amenable number.

13520540324421 is a deficient number, since it is larger than the sum of its proper divisors (7511411291527).

13520540324421 is a wasteful number, since it uses less digits than its factorization.

13520540324421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115560173732 (or 115560173729 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

Adding to 13520540324421 its reverse (12442304502531), we get a palindrome (25962844826952).

The spelling of 13520540324421 in words is "thirteen trillion, five hundred twenty billion, five hundred forty million, three hundred twenty-four thousand, four hundred twenty-one".