4442321021 has 2 divisors, whose sum is σ = 4442321022. Its totient is φ = 4442321020.

The previous prime is 4442321003. The next prime is 4442321029. The reversal of 4442321021 is 1201232444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4376484025 + 65836996 = 66155^2 + 8114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4442321021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4442321029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2221160510 + 2221160511.

It is an arithmetic number, because the mean of its divisors is an integer number (2221160511).

Almost surely, 2^4442321021 is an apocalyptic number.

It is an amenable number.

4442321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4442321021 is an equidigital number, since it uses as much as digits as its factorization.

4442321021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 4442321021 is about 66650.7390881752. The cubic root of 4442321021 is about 1643.8795005491.

Adding to 4442321021 its reverse (1201232444), we get a palindrome (5643553465).

The spelling of 4442321021 in words is "four billion, four hundred forty-two million, three hundred twenty-one thousand, twenty-one".