13521213 has 12 divisors (see below), whose sum is σ = 19573788. Its totient is φ = 8994240.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521213 is 31212531.

It can be written as a sum of positive squares in 2 ways, for example, as 3617604 + 9903609 = 1902^2 + 3147^2 .

It is not a de Polignac number, because 13521213 - 2⁴ = 13521197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3481 + ... + 6257.

It is an arithmetic number, because the mean of its divisors is an integer number (1631149).

Almost surely, 2^13521213 is an apocalyptic number.

It is an amenable number.

13521213 is a deficient number, since it is larger than the sum of its proper divisors (6052575).

13521213 is a wasteful number, since it uses less digits than its factorization.

13521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3324 (or 3321 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 13521213 is about 3677.1202047254. The cubic root of 13521213 is about 238.2348093376.

Adding to 13521213 its reverse (31212531), we get a palindrome (44733744).

The spelling of 13521213 in words is "thirteen million, five hundred twenty-one thousand, two hundred thirteen".