320402021424 has 80 divisors (see below), whose sum is σ = 842295315840. Its totient is φ = 104920496640.

The previous prime is 320402021419. The next prime is 320402021497. The reversal of 320402021424 is 424120204023.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 320402021394 and 320402021403.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4298844 + ... + 4372740.

It is an arithmetic number, because the mean of its divisors is an integer number (10528691448).

Almost surely, 2^320402021424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320402021424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (421147657920).

320402021424 is an abundant number, since it is smaller than the sum of its proper divisors (521893294416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320402021424 is a wasteful number, since it uses less digits than its factorization.

320402021424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75498 (or 75492 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 320402021424 its reverse (424120204023), we get a palindrome (744522225447).

The spelling of 320402021424 in words is "three hundred twenty billion, four hundred two million, twenty-one thousand, four hundred twenty-four".