4442425021 has 2 divisors, whose sum is σ = 4442425022. Its totient is φ = 4442425020.

The previous prime is 4442424991. The next prime is 4442425033. The reversal of 4442425021 is 1205242444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2622464100 + 1819960921 = 51210^2 + 42661^2 .

It is a cyclic number.

It is not a de Polignac number, because 4442425021 - 2⁹ = 4442424509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4442425721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2221212510 + 2221212511.

It is an arithmetic number, because the mean of its divisors is an integer number (2221212511).

Almost surely, 2^4442425021 is an apocalyptic number.

It is an amenable number.

4442425021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4442425021 is an equidigital number, since it uses as much as digits as its factorization.

4442425021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10240, while the sum is 28.

The square root of 4442425021 is about 66651.5192700061. The cubic root of 4442425021 is about 1643.8923288382.

Adding to 4442425021 its reverse (1205242444), we get a palindrome (5647667465).

The spelling of 4442425021 in words is "four billion, four hundred forty-two million, four hundred twenty-five thousand, twenty-one".