13521403213 has 4 divisors (see below), whose sum is σ = 13521788028. Its totient is φ = 13521018400.

The previous prime is 13521403211. The next prime is 13521403223. The reversal of 13521403213 is 31230412531.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31230412531 = 457 ⋅68337883.

It can be written as a sum of positive squares in 2 ways, for example, as 633931684 + 12887471529 = 25178^2 + 113523^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521403213 - 2¹ = 13521403211 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 (13521403211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133738 + ... + 211963.

It is an arithmetic number, because the mean of its divisors is an integer number (3380447007).

Almost surely, 2^13521403213 is an apocalyptic number.

It is an amenable number.

13521403213 is a deficient number, since it is larger than the sum of its proper divisors (384815).

13521403213 is an equidigital number, since it uses as much as digits as its factorization.

13521403213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384814.

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 13521403213 its reverse (31230412531), we get a palindrome (44751815744).

The spelling of 13521403213 in words is "thirteen billion, five hundred twenty-one million, four hundred three thousand, two hundred thirteen".