13521207 has 24 divisors (see below), whose sum is σ = 21340800. Its totient is φ = 7590576.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521207 is 70212531.

It is not a de Polignac number, because 13521207 - 2¹⁰ = 13520183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13521107) 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 23 ways as a sum of consecutive naturals, for example, 7894 + ... + 9452.

It is an arithmetic number, because the mean of its divisors is an integer number (889200).

Almost surely, 2^13521207 is an apocalyptic number.

13521207 is a deficient number, since it is larger than the sum of its proper divisors (7819593).

13521207 is a wasteful number, since it uses less digits than its factorization.

13521207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 13521207 is about 3677.1193888695. The cubic root of 13521207 is about 238.2347740989.

Adding to 13521207 its reverse (70212531), we get a palindrome (83733738).

The spelling of 13521207 in words is "thirteen million, five hundred twenty-one thousand, two hundred seven".