13312121 has 4 divisors (see below), whose sum is σ = 13472592. Its totient is φ = 13151652.

The previous prime is 13312109. The next prime is 13312129. The reversal of 13312121 is 12121331.

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 13312121 - 2¹⁰ = 13311097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13312096 and 13312105.

It is not an unprimeable number, because it can be changed into a prime (13312129) 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, 80111 + ... + 80276.

It is an arithmetic number, because the mean of its divisors is an integer number (3368148).

Almost surely, 2^13312121 is an apocalyptic number.

It is an amenable number.

13312121 is a deficient number, since it is larger than the sum of its proper divisors (160471).

13312121 is an equidigital number, since it uses as much as digits as its factorization.

13312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160470.

The product of its digits is 36, while the sum is 14.

The square root of 13312121 is about 3648.5779421577. The cubic root of 13312121 is about 237.0004035434. Note that the first 3 decimals are identical.

Adding to 13312121 its reverse (12121331), we get a palindrome (25433452).

The spelling of 13312121 in words is "thirteen million, three hundred twelve thousand, one hundred twenty-one".