21033021133 has 2 divisors, whose sum is σ = 21033021134. Its totient is φ = 21033021132.

The previous prime is 21033021131. The next prime is 21033021211. The reversal of 21033021133 is 33112033012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17512022889 + 3520998244 = 132333^2 + 59338^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033021133 - 2¹ = 21033021131 is a prime.

Together with 21033021131, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21033021133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033021131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10516510566 + 10516510567.

It is an arithmetic number, because the mean of its divisors is an integer number (10516510567).

Almost surely, 2^21033021133 is an apocalyptic number.

It is an amenable number.

21033021133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033021133 is an equidigital number, since it uses as much as digits as its factorization.

21033021133 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 19.

Adding to 21033021133 its reverse (33112033012), we get a palindrome (54145054145).

The spelling of 21033021133 in words is "twenty-one billion, thirty-three million, twenty-one thousand, one hundred thirty-three".