13212391 has 4 divisors (see below), whose sum is σ = 13907800. Its totient is φ = 12516984.

The previous prime is 13212377. The next prime is 13212403. The reversal of 13212391 is 19321231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13212391 - 2⁷ = 13212263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13212341) 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, 347676 + ... + 347713.

It is an arithmetic number, because the mean of its divisors is an integer number (3476950).

Almost surely, 2^13212391 is an apocalyptic number.

13212391 is a deficient number, since it is larger than the sum of its proper divisors (695409).

13212391 is an equidigital number, since it uses as much as digits as its factorization.

13212391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695408.

The product of its digits is 324, while the sum is 22.

The square root of 13212391 is about 3634.8852801705. The cubic root of 13212391 is about 236.4070765640.

The spelling of 13212391 in words is "thirteen million, two hundred twelve thousand, three hundred ninety-one".