12843421 has 2 divisors, whose sum is σ = 12843422. Its totient is φ = 12843420.

The previous prime is 12843409. The next prime is 12843451. The reversal of 12843421 is 12434821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 864900 = 3461^2 + 930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12843421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12843451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6421710 + 6421711.

It is an arithmetic number, because the mean of its divisors is an integer number (6421711).

Almost surely, 2^12843421 is an apocalyptic number.

It is an amenable number.

12843421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12843421 is an equidigital number, since it uses as much as digits as its factorization.

12843421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 12843421 is about 3583.7718956429. The cubic root of 12843421 is about 234.1856283887.

The spelling of 12843421 in words is "twelve million, eight hundred forty-three thousand, four hundred twenty-one".