21033330013 has 2 divisors, whose sum is σ = 21033330014. Its totient is φ = 21033330012.

The previous prime is 21033329981. The next prime is 21033330041. The reversal of 21033330013 is 31003333012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19830835684 + 1202494329 = 140822^2 + 34677^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033330013 - 2⁵ = 21033329981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033330613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516665006 + 10516665007.

It is an arithmetic number, because the mean of its divisors is an integer number (10516665007).

Almost surely, 2^21033330013 is an apocalyptic number.

It is an amenable number.

21033330013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033330013 is an equidigital number, since it uses as much as digits as its factorization.

21033330013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 19.

Adding to 21033330013 its reverse (31003333012), we get a palindrome (52036663025).

The spelling of 21033330013 in words is "twenty-one billion, thirty-three million, three hundred thirty thousand, thirteen".