42317321 has 2 divisors, whose sum is σ = 42317322. Its totient is φ = 42317320.

The previous prime is 42317311. The next prime is 42317339. The reversal of 42317321 is 12371324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32947600 + 9369721 = 5740^2 + 3061^2 .

It is a cyclic number.

It is not a de Polignac number, because 42317321 - 2²² = 38123017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42317311) 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, 21158660 + 21158661.

It is an arithmetic number, because the mean of its divisors is an integer number (21158661).

Almost surely, 2^42317321 is an apocalyptic number.

It is an amenable number.

42317321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42317321 is an equidigital number, since it uses as much as digits as its factorization.

42317321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 42317321 is about 6505.1764772372. The cubic root of 42317321 is about 348.4758787691.

Adding to 42317321 its reverse (12371324), we get a palindrome (54688645).

The spelling of 42317321 in words is "forty-two million, three hundred seventeen thousand, three hundred twenty-one".