42401321 has 2 divisors, whose sum is σ = 42401322. Its totient is φ = 42401320.

The previous prime is 42401309. The next prime is 42401347. The reversal of 42401321 is 12310424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42250000 + 151321 = 6500^2 + 389^2 .

It is a cyclic number.

It is not a de Polignac number, because 42401321 - 2¹⁰ = 42400297 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42401321.

It is not a weakly prime, because it can be changed into another prime (42400321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21200660 + 21200661.

It is an arithmetic number, because the mean of its divisors is an integer number (21200661).

Almost surely, 2^42401321 is an apocalyptic number.

It is an amenable number.

42401321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42401321 is an equidigital number, since it uses as much as digits as its factorization.

42401321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 42401321 is about 6511.6296731310. The cubic root of 42401321 is about 348.7063015695.

Adding to 42401321 its reverse (12310424), we get a palindrome (54711745).

The spelling of 42401321 in words is "forty-two million, four hundred one thousand, three hundred twenty-one".