13217231 has 4 divisors (see below), whose sum is σ = 13338600. Its totient is φ = 13095864.

The previous prime is 13217221. The next prime is 13217233. The reversal of 13217231 is 13271231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13271231 = 677 ⋅19603.

It is a cyclic number.

It is not a de Polignac number, because 13217231 - 2⁶ = 13217167 is a prime.

It is a super-2 number, since 2×13217231² = 349390390614722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13217233) 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, 60521 + ... + 60738.

It is an arithmetic number, because the mean of its divisors is an integer number (3334650).

Almost surely, 2^13217231 is an apocalyptic number.

13217231 is a deficient number, since it is larger than the sum of its proper divisors (121369).

13217231 is a wasteful number, since it uses less digits than its factorization.

13217231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121368.

The product of its digits is 252, while the sum is 20.

The square root of 13217231 is about 3635.5509898776. The cubic root of 13217231 is about 236.4359401402.

Adding to 13217231 its reverse (13271231), we get a palindrome (26488462).

The spelling of 13217231 in words is "thirteen million, two hundred seventeen thousand, two hundred thirty-one".