320042021 has 4 divisors (see below), whose sum is σ = 344660652. Its totient is φ = 295423392.

The previous prime is 320042011. The next prime is 320042027. The reversal of 320042021 is 120240023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34093921 + 285948100 = 5839^2 + 16910^2 .

It is a cyclic number.

It is not a de Polignac number, because 320042021 - 2⁶ = 320041957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320041987 and 320042005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320042027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12309296 + ... + 12309321.

It is an arithmetic number, because the mean of its divisors is an integer number (86165163).

Almost surely, 2^320042021 is an apocalyptic number.

It is an amenable number.

320042021 is a deficient number, since it is larger than the sum of its proper divisors (24618631).

320042021 is a wasteful number, since it uses less digits than its factorization.

320042021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24618630.

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

The square root of 320042021 is about 17889.7183040986. The cubic root of 320042021 is about 684.0203169016.

Adding to 320042021 its reverse (120240023), we get a palindrome (440282044).

The spelling of 320042021 in words is "three hundred twenty million, forty-two thousand, twenty-one".