4030420021 has 2 divisors, whose sum is σ = 4030420022. Its totient is φ = 4030420020.

The previous prime is 4030420013. The next prime is 4030420067. The reversal of 4030420021 is 1200240304.

4030420021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2137212900 + 1893207121 = 46230^2 + 43511^2 .

It is a cyclic number.

It is not a de Polignac number, because 4030420021 - 2³ = 4030420013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4030419977 and 4030420004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4030420321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2015210010 + 2015210011.

It is an arithmetic number, because the mean of its divisors is an integer number (2015210011).

Almost surely, 2^4030420021 is an apocalyptic number.

It is an amenable number.

4030420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4030420021 is an equidigital number, since it uses as much as digits as its factorization.

4030420021 is an evil number, because the sum of its binary digits is even.

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

The square root of 4030420021 is about 63485.5890813025. The cubic root of 4030420021 is about 1591.4149582845.

Adding to 4030420021 its reverse (1200240304), we get a palindrome (5230660325).

The spelling of 4030420021 in words is "four billion, thirty million, four hundred twenty thousand, twenty-one".