320421403 has 4 divisors (see below), whose sum is σ = 325203880. Its totient is φ = 315638928.

The previous prime is 320421391. The next prime is 320421433. The reversal of 320421403 is 304124023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304124023 = 7 ⋅43446289.

It is a cyclic number.

It is not a de Polignac number, because 320421403 - 2¹⁷ = 320290331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320421433) 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, 2391138 + ... + 2391271.

It is an arithmetic number, because the mean of its divisors is an integer number (81300970).

Almost surely, 2^320421403 is an apocalyptic number.

320421403 is a deficient number, since it is larger than the sum of its proper divisors (4782477).

320421403 is an equidigital number, since it uses as much as digits as its factorization.

320421403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4782476.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 320421403 is about 17900.3185167192. The cubic root of 320421403 is about 684.2904923850.

Adding to 320421403 its reverse (304124023), we get a palindrome (624545426).

The spelling of 320421403 in words is "three hundred twenty million, four hundred twenty-one thousand, four hundred three".