320442421 has 6 divisors (see below), whose sum is σ = 346988130. Its totient is φ = 295792848.

The previous prime is 320442403. The next prime is 320442449. The reversal of 320442421 is 124244023.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4100625 + 316341796 = 2025^2 + 17786^2 .

It is not a de Polignac number, because 320442421 - 2¹⁵ = 320409653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320442392 and 320442401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320442481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 947886 + ... + 948223.

It is an arithmetic number, because the mean of its divisors is an integer number (57831355).

Almost surely, 2^320442421 is an apocalyptic number.

It is an amenable number.

320442421 is a deficient number, since it is larger than the sum of its proper divisors (26545709).

320442421 is a wasteful number, since it uses less digits than its factorization.

320442421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896135 (or 1896122 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 320442421 is about 17900.9055916174. The cubic root of 320442421 is about 684.3054540396.

Adding to 320442421 its reverse (124244023), we get a palindrome (444686444).

The spelling of 320442421 in words is "three hundred twenty million, four hundred forty-two thousand, four hundred twenty-one".