12721043 has 2 divisors, whose sum is σ = 12721044. Its totient is φ = 12721042.

The previous prime is 12721039. The next prime is 12721087. The reversal of 12721043 is 34012721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12721043 - 2² = 12721039 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12721843) 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 as a sum of consecutive naturals, namely, 6360521 + 6360522.

It is an arithmetic number, because the mean of its divisors is an integer number (6360522).

Almost surely, 2^12721043 is an apocalyptic number.

12721043 is a deficient number, since it is larger than the sum of its proper divisors (1).

12721043 is an equidigital number, since it uses as much as digits as its factorization.

12721043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 12721043 is about 3566.6571183673. The cubic root of 12721043 is about 233.4394440280.

Adding to 12721043 its reverse (34012721), we get a palindrome (46733764).

The spelling of 12721043 in words is "twelve million, seven hundred twenty-one thousand, forty-three".