13042321 has 2 divisors, whose sum is σ = 13042322. Its totient is φ = 13042320.

The previous prime is 13042313. The next prime is 13042333. The reversal of 13042321 is 12324031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 190096 = 3585^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 13042321 - 2³ = 13042313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13042295 and 13042304.

It is not a weakly prime, because it can be changed into another prime (13045321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6521160 + 6521161.

It is an arithmetic number, because the mean of its divisors is an integer number (6521161).

Almost surely, 2^13042321 is an apocalyptic number.

It is an amenable number.

13042321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13042321 is an equidigital number, since it uses as much as digits as its factorization.

13042321 is an odious number, because the sum of its binary digits is odd.

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

The square root of 13042321 is about 3611.4153735066. The cubic root of 13042321 is about 235.3883483763.

Adding to 13042321 its reverse (12324031), we get a palindrome (25366352).

The spelling of 13042321 in words is "thirteen million, forty-two thousand, three hundred twenty-one".