42718321 has 2 divisors, whose sum is σ = 42718322. Its totient is φ = 42718320.

The previous prime is 42718303. The next prime is 42718343. The reversal of 42718321 is 12381724.

42718321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 5934096 = 6065^2 + 2436^2 .

It is a cyclic number.

It is not a de Polignac number, because 42718321 - 2¹¹ = 42716273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42718321.

It is not a weakly prime, because it can be changed into another prime (42718021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21359160 + 21359161.

It is an arithmetic number, because the mean of its divisors is an integer number (21359161).

Almost surely, 2^42718321 is an apocalyptic number.

It is an amenable number.

42718321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42718321 is an equidigital number, since it uses as much as digits as its factorization.

42718321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 28.

The square root of 42718321 is about 6535.9254126711. The cubic root of 42718321 is about 349.5731422036.

The spelling of 42718321 in words is "forty-two million, seven hundred eighteen thousand, three hundred twenty-one".