13213231 has 2 divisors, whose sum is σ = 13213232. Its totient is φ = 13213230.

The previous prime is 13213229. The next prime is 13213237. The reversal of 13213231 is 13231231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13213231 - 2¹ = 13213229 is a prime.

It is a super-2 number, since 2×13213231² = 349178946918722, which contains 22 as substring.

Together with 13213229, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13213237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606615 + 6606616.

It is an arithmetic number, because the mean of its divisors is an integer number (6606616).

Almost surely, 2^13213231 is an apocalyptic number.

13213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213231 is an equidigital number, since it uses as much as digits as its factorization.

13213231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 16.

The square root of 13213231 is about 3635.0008253094. Note that the first 3 decimals coincide. The cubic root of 13213231 is about 236.4120864504.

Adding to 13213231 its reverse (13231231), we get a palindrome (26444462).

The spelling of 13213231 in words is "thirteen million, two hundred thirteen thousand, two hundred thirty-one".