21303001033 has 2 divisors, whose sum is σ = 21303001034. Its totient is φ = 21303001032.

The previous prime is 21303001009. The next prime is 21303001117. The reversal of 21303001033 is 33010030312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12279520969 + 9023480064 = 110813^2 + 94992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303001033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303000998 and 21303001016.

It is not a weakly prime, because it can be changed into another prime (21303001333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651500516 + 10651500517.

It is an arithmetic number, because the mean of its divisors is an integer number (10651500517).

Almost surely, 2^21303001033 is an apocalyptic number.

It is an amenable number.

21303001033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303001033 is an equidigital number, since it uses as much as digits as its factorization.

21303001033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 21303001033 its reverse (33010030312), we get a palindrome (54313031345).

The spelling of 21303001033 in words is "twenty-one billion, three hundred three million, one thousand, thirty-three".