4343404021 has 6 divisors (see below), whose sum is σ = 4774154966. Its totient is φ = 3948549000.

The previous prime is 4343403959. The next prime is 4343404073. The reversal of 4343404021 is 1204043434.

It can be written as a sum of positive squares in only one way, i.e., 3694937796 + 648466225 = 60786^2 + 25465^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4343404021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4343404081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17947830 + ... + 17948071.

Almost surely, 2^4343404021 is an apocalyptic number.

It is an amenable number.

4343404021 is a deficient number, since it is larger than the sum of its proper divisors (430750945).

4343404021 is a wasteful number, since it uses less digits than its factorization.

4343404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35895923 (or 35895912 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 4343404021 is about 65904.5068337515. The cubic root of 4343404021 is about 1631.5863990028.

Adding to 4343404021 its reverse (1204043434), we get a palindrome (5547447455).

The spelling of 4343404021 in words is "four billion, three hundred forty-three million, four hundred four thousand, twenty-one".