13213257 has 4 divisors (see below), whose sum is σ = 17617680. Its totient is φ = 8808836.

The previous prime is 13213253. The next prime is 13213259. The reversal of 13213257 is 75231231.

13213257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13213257 - 2² = 13213253 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13213253) 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, 2202207 + ... + 2202212.

It is an arithmetic number, because the mean of its divisors is an integer number (4404420).

Almost surely, 2^13213257 is an apocalyptic number.

It is an amenable number.

13213257 is a deficient number, since it is larger than the sum of its proper divisors (4404423).

13213257 is an equidigital number, since it uses as much as digits as its factorization.

13213257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4404422.

The product of its digits is 1260, while the sum is 24.

The square root of 13213257 is about 3635.0044016480. The cubic root of 13213257 is about 236.4122415150.

Adding to 13213257 its reverse (75231231), we get a palindrome (88444488).

The spelling of 13213257 in words is "thirteen million, two hundred thirteen thousand, two hundred fifty-seven".