42043321 has 2 divisors, whose sum is σ = 42043322. Its totient is φ = 42043320.

The previous prime is 42043319. The next prime is 42043357. The reversal of 42043321 is 12334024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39237696 + 2805625 = 6264^2 + 1675^2 .

It is a cyclic number.

It is not a de Polignac number, because 42043321 - 2¹ = 42043319 is a prime.

Together with 42043319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42043021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021660 + 21021661.

It is an arithmetic number, because the mean of its divisors is an integer number (21021661).

Almost surely, 2^42043321 is an apocalyptic number.

It is an amenable number.

42043321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043321 is an equidigital number, since it uses as much as digits as its factorization.

42043321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 42043321 is about 6484.0821247113. The cubic root of 42043321 is about 347.7221352872.

Adding to 42043321 its reverse (12334024), we get a palindrome (54377345).

The spelling of 42043321 in words is "forty-two million, forty-three thousand, three hundred twenty-one".