20024444021 has 2 divisors, whose sum is σ = 20024444022. Its totient is φ = 20024444020.

The previous prime is 20024444009. The next prime is 20024444029. The reversal of 20024444021 is 12044442002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16075704100 + 3948739921 = 126790^2 + 62839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20024444021 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20024444029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10012222010 + 10012222011.

It is an arithmetic number, because the mean of its divisors is an integer number (10012222011).

Almost surely, 2^20024444021 is an apocalyptic number.

It is an amenable number.

20024444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20024444021 is an equidigital number, since it uses as much as digits as its factorization.

20024444021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 20024444021 its reverse (12044442002), we get a palindrome (32068886023).

The spelling of 20024444021 in words is "twenty billion, twenty-four million, four hundred forty-four thousand, twenty-one".