13521216 has 28 divisors (see below), whose sum is σ = 35775392. Its totient is φ = 4507008.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521216 is 61212531.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 13521192 and 13521201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35020 + ... + 35403.

Almost surely, 2^13521216 is an apocalyptic number.

13521216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13521216 is an abundant number, since it is smaller than the sum of its proper divisors (22254176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13521216 is an equidigital number, since it uses as much as digits as its factorization.

13521216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70438 (or 70428 counting only the distinct ones).

The product of its digits is 360, while the sum is 21.

The square root of 13521216 is about 3677.1206126533. The cubic root of 13521216 is about 238.2348269570.

Adding to 13521216 its reverse (61212531), we get a palindrome (74733747).

The spelling of 13521216 in words is "thirteen million, five hundred twenty-one thousand, two hundred sixteen".