21033311321233 has 4 divisors (see below), whose sum is σ = 21043408928368. Its totient is φ = 21023213714100.

The previous prime is 21033311321203. The next prime is 21033311321249. The reversal of 21033311321233 is 33212311333012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21033311321233 - 2⁵ = 21033311321201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21033311321203) 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 in 3 ways as a sum of consecutive naturals, for example, 5048800443 + ... + 5048804608.

It is an arithmetic number, because the mean of its divisors is an integer number (5260852232092).

Almost surely, 2^{21033311321233} is an apocalyptic number.

It is an amenable number.

21033311321233 is a deficient number, since it is larger than the sum of its proper divisors (10097607135).

21033311321233 is a wasteful number, since it uses less digits than its factorization.

21033311321233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10097607134.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21033311321233 its reverse (33212311333012), we get a palindrome (54245622654245).

The spelling of 21033311321233 in words is "twenty-one trillion, thirty-three billion, three hundred eleven million, three hundred twenty-one thousand, two hundred thirty-three".