13402321 has 4 divisors (see below), whose sum is σ = 13864500. Its totient is φ = 12940144.

The previous prime is 13402309. The next prime is 13402327. The reversal of 13402321 is 12320431.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8473921 + 4928400 = 2911^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 13402321 - 2¹¹ = 13400273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13402295 and 13402304.

It is not an unprimeable number, because it can be changed into a prime (13402327) 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, 231046 + ... + 231103.

It is an arithmetic number, because the mean of its divisors is an integer number (3466125).

Almost surely, 2^13402321 is an apocalyptic number.

It is an amenable number.

13402321 is a deficient number, since it is larger than the sum of its proper divisors (462179).

13402321 is an equidigital number, since it uses as much as digits as its factorization.

13402321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462178.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13402321 is about 3660.9180542591. The cubic root of 13402321 is about 237.5344865895.

Adding to 13402321 its reverse (12320431), we get a palindrome (25722752).

The spelling of 13402321 in words is "thirteen million, four hundred two thousand, three hundred twenty-one".