321224420 has 24 divisors (see below), whose sum is σ = 735896448. Its totient is φ = 116808800.

The previous prime is 321224419. The next prime is 321224429. The reversal of 321224420 is 24422123.

321224420 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

321224420 is strictly pandigital in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 321224392 and 321224401.

It is not an unprimeable number, because it can be changed into a prime (321224429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729836 + ... + 730275.

It is an arithmetic number, because the mean of its divisors is an integer number (30662352).

Almost surely, 2^321224420 is an apocalyptic number.

It is an amenable number.

321224420 is an abundant number, since it is smaller than the sum of its proper divisors (414672028).

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

321224420 is a wasteful number, since it uses less digits than its factorization.

321224420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460131 (or 1460129 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 321224420 is about 17922.7347243661. The cubic root of 321224420 is about 684.8616553334.

Adding to 321224420 its reverse (24422123), we get a palindrome (345646543).

The spelling of 321224420 in words is "three hundred twenty-one million, two hundred twenty-four thousand, four hundred twenty".