21303020033 has 2 divisors, whose sum is σ = 21303020034. Its totient is φ = 21303020032.

The previous prime is 21303019949. The next prime is 21303020047. The reversal of 21303020033 is 33002030312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16592531344 + 4710488689 = 128812^2 + 68633^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303020033 - 2¹⁰ = 21303019009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21303019993 and 21303020020.

It is not a weakly prime, because it can be changed into another prime (21303020633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651510016 + 10651510017.

It is an arithmetic number, because the mean of its divisors is an integer number (10651510017).

Almost surely, 2^21303020033 is an apocalyptic number.

It is an amenable number.

21303020033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303020033 is an equidigital number, since it uses as much as digits as its factorization.

21303020033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 17.

Adding to 21303020033 its reverse (33002030312), we get a palindrome (54305050345).

The spelling of 21303020033 in words is "twenty-one billion, three hundred three million, twenty thousand, thirty-three".