42021305 has 8 divisors (see below), whose sum is σ = 50464512. Its totient is φ = 33591088.

The previous prime is 42021257. The next prime is 42021313. The reversal of 42021305 is 50312024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42021305 - 2⁶ = 42021241 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 6584 + ... + 11286.

It is an arithmetic number, because the mean of its divisors is an integer number (6308064).

Almost surely, 2^42021305 is an apocalyptic number.

It is an amenable number.

42021305 is a deficient number, since it is larger than the sum of its proper divisors (8443207).

42021305 is a wasteful number, since it uses less digits than its factorization.

42021305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6495.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42021305 is about 6482.3842064475. The cubic root of 42021305 is about 347.6614297499.

Adding to 42021305 its reverse (50312024), we get a palindrome (92333329).

The spelling of 42021305 in words is "forty-two million, twenty-one thousand, three hundred five".