43021420 has 48 divisors (see below), whose sum is σ = 97782048. Its totient is φ = 15805440.

The previous prime is 43021399. The next prime is 43021421. The reversal of 43021420 is 2412034.

It is a junction number, because it is equal to n+sod(n) for n = 43021394 and 43021403.

It is not an unprimeable number, because it can be changed into a prime (43021421) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 87375 + ... + 87865.

It is an arithmetic number, because the mean of its divisors is an integer number (2037126).

Almost surely, 2^43021420 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 43021420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48891024).

43021420 is an abundant number, since it is smaller than the sum of its proper divisors (54760628).

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

43021420 is a wasteful number, since it uses less digits than its factorization.

43021420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 43021420 is about 6559.0715806431. The cubic root of 43021420 is about 350.3979690846.

Adding to 43021420 its reverse (2412034), we get a palindrome (45433454).

The spelling of 43021420 in words is "forty-three million, twenty-one thousand, four hundred twenty".