42668321 has 2 divisors, whose sum is σ = 42668322. Its totient is φ = 42668320.

The previous prime is 42668303. The next prime is 42668323. The reversal of 42668321 is 12386624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34939921 + 7728400 = 5911^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 42668321 - 2⁶ = 42668257 is a prime.

Together with 42668323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42668323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21334160 + 21334161.

It is an arithmetic number, because the mean of its divisors is an integer number (21334161).

Almost surely, 2^42668321 is an apocalyptic number.

It is an amenable number.

42668321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42668321 is an equidigital number, since it uses as much as digits as its factorization.

42668321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 32.

The square root of 42668321 is about 6532.0992797109. The cubic root of 42668321 is about 349.4367020652.

The spelling of 42668321 in words is "forty-two million, six hundred sixty-eight thousand, three hundred twenty-one".