42421321 has 2 divisors, whose sum is σ = 42421322. Its totient is φ = 42421320.

The previous prime is 42421289. The next prime is 42421363. The reversal of 42421321 is 12312424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21261321 + 21160000 = 4611^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421321 - 2⁵ = 42421289 is a prime.

It is not a weakly prime, because it can be changed into another prime (42421381) 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, 21210660 + 21210661.

It is an arithmetic number, because the mean of its divisors is an integer number (21210661).

Almost surely, 2^42421321 is an apocalyptic number.

It is an amenable number.

42421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42421321 is an equidigital number, since it uses as much as digits as its factorization.

42421321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 19.

The square root of 42421321 is about 6513.1652059502. The cubic root of 42421321 is about 348.7611192782.

Adding to 42421321 its reverse (12312424), we get a palindrome (54733745).

The spelling of 42421321 in words is "forty-two million, four hundred twenty-one thousand, three hundred twenty-one".