13521217 has 8 divisors (see below), whose sum is σ = 14852160. Its totient is φ = 12252240.

The previous prime is 13521197. The next prime is 13521253. The reversal of 13521217 is 71212531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13521217 - 2¹¹ = 13519169 is a prime.

It is a super-2 number, since 2×13521217² = 365646618322178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13521517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15034 + ... + 15907.

It is an arithmetic number, because the mean of its divisors is an integer number (1856520).

Almost surely, 2^13521217 is an apocalyptic number.

It is an amenable number.

13521217 is a deficient number, since it is larger than the sum of its proper divisors (1330943).

13521217 is a wasteful number, since it uses less digits than its factorization.

13521217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30983.

The product of its digits is 420, while the sum is 22.

The square root of 13521217 is about 3677.1207486293. The cubic root of 13521217 is about 238.2348328301.

Adding to 13521217 its reverse (71212531), we get a palindrome (84733748).

The spelling of 13521217 in words is "thirteen million, five hundred twenty-one thousand, two hundred seventeen".