4021320 has 128 divisors (see below), whose sum is σ = 13271040. Its totient is φ = 971520.

The previous prime is 4021309. The next prime is 4021349. The reversal of 4021320 is 231204.

4021320 is digitally balanced in base 2, because in such base 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 (12).

It is a junction number, because it is equal to n+sod(n) for n = 4021296 and 4021305.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85537 + ... + 85583.

It is an arithmetic number, because the mean of its divisors is an integer number (103680).

Almost surely, 2^4021320 is an apocalyptic number.

4021320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4021320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6635520).

4021320 is an abundant number, since it is smaller than the sum of its proper divisors (9249720).

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

4021320 is a wasteful number, since it uses less digits than its factorization.

4021320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4021320 is about 2005.3229166396. The cubic root of 4021320 is about 159.0216338587.

Adding to 4021320 its reverse (231204), we get a palindrome (4252524).

The spelling of 4021320 in words is "four million, twenty-one thousand, three hundred twenty".