13421321 has 4 divisors (see below), whose sum is σ = 13430544. Its totient is φ = 13412100.

The previous prime is 13421299. The next prime is 13421323. The reversal of 13421321 is 12312431.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13421321 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13421321.

It is not an unprimeable number, because it can be changed into a prime (13421323) 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, 1895 + ... + 5516.

It is an arithmetic number, because the mean of its divisors is an integer number (3357636).

Almost surely, 2^13421321 is an apocalyptic number.

It is an amenable number.

13421321 is a deficient number, since it is larger than the sum of its proper divisors (9223).

13421321 is an equidigital number, since it uses as much as digits as its factorization.

13421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9222.

The product of its digits is 144, while the sum is 17.

The square root of 13421321 is about 3663.5121127137. The cubic root of 13421321 is about 237.6466816889.

Adding to 13421321 its reverse (12312431), we get a palindrome (25733752).

The spelling of 13421321 in words is "thirteen million, four hundred twenty-one thousand, three hundred twenty-one".