20104444021 has 2 divisors, whose sum is σ = 20104444022. Its totient is φ = 20104444020.

The previous prime is 20104443991. The next prime is 20104444037. The reversal of 20104444021 is 12044440102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11425472100 + 8678971921 = 106890^2 + 93161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20104444021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20104443983 and 20104444001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20104444081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052222010 + 10052222011.

It is an arithmetic number, because the mean of its divisors is an integer number (10052222011).

Almost surely, 2^20104444021 is an apocalyptic number.

It is an amenable number.

20104444021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104444021 is an equidigital number, since it uses as much as digits as its factorization.

20104444021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 20104444021 its reverse (12044440102), we get a palindrome (32148884123).

The spelling of 20104444021 in words is "twenty billion, one hundred four million, four hundred forty-four thousand, twenty-one".