42331321 has 2 divisors, whose sum is σ = 42331322. Its totient is φ = 42331320.

The previous prime is 42331319. The next prime is 42331361. The reversal of 42331321 is 12313324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25644096 + 16687225 = 5064^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 42331321 - 2¹ = 42331319 is a prime.

Together with 42331319, 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 (42331301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165660 + 21165661.

It is an arithmetic number, because the mean of its divisors is an integer number (21165661).

Almost surely, 2^42331321 is an apocalyptic number.

It is an amenable number.

42331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42331321 is an equidigital number, since it uses as much as digits as its factorization.

42331321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 19.

The square root of 42331321 is about 6506.2524543703. The cubic root of 42331321 is about 348.5143037314.

Adding to 42331321 its reverse (12313324), we get a palindrome (54644645).

The spelling of 42331321 in words is "forty-two million, three hundred thirty-one thousand, three hundred twenty-one".