20243203021 has 2 divisors, whose sum is σ = 20243203022. Its totient is φ = 20243203020.

The previous prime is 20243202989. The next prime is 20243203037. The reversal of 20243203021 is 12030234202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12948164100 + 7295038921 = 113790^2 + 85411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20243203021 - 2⁵ = 20243202989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20243203021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243203121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121601510 + 10121601511.

It is an arithmetic number, because the mean of its divisors is an integer number (10121601511).

Almost surely, 2^20243203021 is an apocalyptic number.

It is an amenable number.

20243203021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243203021 is an equidigital number, since it uses as much as digits as its factorization.

20243203021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20243203021 its reverse (12030234202), we get a palindrome (32273437223).

The spelling of 20243203021 in words is "twenty billion, two hundred forty-three million, two hundred three thousand, twenty-one".