4430420021 has 2 divisors, whose sum is σ = 4430420022. Its totient is φ = 4430420020.

The previous prime is 4430420017. The next prime is 4430420051. The reversal of 4430420021 is 1200240344.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3437476900 + 992943121 = 58630^2 + 31511^2 .

It is a cyclic number.

It is not a de Polignac number, because 4430420021 - 2² = 4430420017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4430419975 and 4430420002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4430420051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2215210010 + 2215210011.

It is an arithmetic number, because the mean of its divisors is an integer number (2215210011).

Almost surely, 2^4430420021 is an apocalyptic number.

It is an amenable number.

4430420021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4430420021 is an equidigital number, since it uses as much as digits as its factorization.

4430420021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4430420021 is about 66561.4003834054. The cubic root of 4430420021 is about 1642.4102005739.

Adding to 4430420021 its reverse (1200240344), we get a palindrome (5630660365).

The spelling of 4430420021 in words is "four billion, four hundred thirty million, four hundred twenty thousand, twenty-one".