13212321 has 4 divisors (see below), whose sum is σ = 17616432. Its totient is φ = 8808212.

The previous prime is 13212307. The next prime is 13212337. The reversal of 13212321 is 12321231.

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 13212321 - 2⁵ = 13212289 is a prime.

It is a super-3 number, since 3×13212321³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13212321.

It is not an unprimeable number, because it can be changed into a prime (13212341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202051 + ... + 2202056.

It is an arithmetic number, because the mean of its divisors is an integer number (4404108).

Almost surely, 2^13212321 is an apocalyptic number.

It is an amenable number.

13212321 is a deficient number, since it is larger than the sum of its proper divisors (4404111).

13212321 is an equidigital number, since it uses as much as digits as its factorization.

13212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4404110.

The product of its digits is 72, while the sum is 15.

The square root of 13212321 is about 3634.8756512431. The cubic root of 13212321 is about 236.4066590639.

Adding to 13212321 its reverse (12321231), we get a palindrome (25533552).

The spelling of 13212321 in words is "thirteen million, two hundred twelve thousand, three hundred twenty-one".