4320021420 has 288 divisors, whose sum is σ = 15507535680. Its totient is φ = 959662080.

The previous prime is 4320021397. The next prime is 4320021421. The reversal of 4320021420 is 241200234.

4320021420 is a `hidden beast` number, since 43 + 200 + 2 + 1 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4320021393 and 4320021402.

It is not an unprimeable number, because it can be changed into a prime (4320021421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4040646 + ... + 4041714.

It is an arithmetic number, because the mean of its divisors is an integer number (53845610).

Almost surely, 2^4320021420 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 4320021420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7753767840).

4320021420 is an abundant number, since it is smaller than the sum of its proper divisors (11187514260).

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

4320021420 is a wasteful number, since it uses less digits than its factorization.

4320021420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1265 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4320021420 is about 65726.8698478788. The cubic root of 4320021420 is about 1628.6532617500.

Adding to 4320021420 its reverse (241200234), we get a palindrome (4561221654).

It can be divided in two parts, 43200214 and 20, that added together give a palindrome (43200234).

The spelling of 4320021420 in words is "four billion, three hundred twenty million, twenty-one thousand, four hundred twenty".