320421421 has 4 divisors (see below), whose sum is σ = 320859292. Its totient is φ = 319983552.

The previous prime is 320421391. The next prime is 320421433. The reversal of 320421421 is 124124023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124124023 = 59 ⋅2103797.

It can be written as a sum of positive squares in 2 ways, for example, as 138980521 + 181440900 = 11789^2 + 13470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320421421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320421481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217836 + ... + 219301.

It is an arithmetic number, because the mean of its divisors is an integer number (80214823).

Almost surely, 2^320421421 is an apocalyptic number.

It is an amenable number.

320421421 is a deficient number, since it is larger than the sum of its proper divisors (437871).

320421421 is an equidigital number, since it uses as much as digits as its factorization.

320421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437870.

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

The square root of 320421421 is about 17900.3190195035. The cubic root of 320421421 is about 684.2905051985.

Adding to 320421421 its reverse (124124023), we get a palindrome (444545444).

The spelling of 320421421 in words is "three hundred twenty million, four hundred twenty-one thousand, four hundred twenty-one".