42020321 has 4 divisors (see below), whose sum is σ = 48023232. Its totient is φ = 36017412.

The previous prime is 42020317. The next prime is 42020339. The reversal of 42020321 is 12302024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42020321 - 2² = 42020317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42020296 and 42020305.

It is not an unprimeable number, because it can be changed into a prime (42020351) 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 in 3 ways as a sum of consecutive naturals, for example, 3001445 + ... + 3001458.

It is an arithmetic number, because the mean of its divisors is an integer number (12005808).

Almost surely, 2^42020321 is an apocalyptic number.

It is an amenable number.

42020321 is a deficient number, since it is larger than the sum of its proper divisors (6002911).

42020321 is an equidigital number, since it uses as much as digits as its factorization.

42020321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002910.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 42020321 is about 6482.3083080026. The cubic root of 42020321 is about 347.6587160350.

Adding to 42020321 its reverse (12302024), we get a palindrome (54322345).

The spelling of 42020321 in words is "forty-two million, twenty thousand, three hundred twenty-one".