21320013133 has 2 divisors, whose sum is σ = 21320013134. Its totient is φ = 21320013132.

The previous prime is 21320013073. The next prime is 21320013151. The reversal of 21320013133 is 33131002312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12468402244 + 8851610889 = 111662^2 + 94083^2 .

It is a cyclic number.

It is not a de Polignac number, because 21320013133 - 2¹³ = 21320004941 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21320013133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320053133) 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 as a sum of consecutive naturals, namely, 10660006566 + 10660006567.

It is an arithmetic number, because the mean of its divisors is an integer number (10660006567).

Almost surely, 2^21320013133 is an apocalyptic number.

It is an amenable number.

21320013133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320013133 is an equidigital number, since it uses as much as digits as its factorization.

21320013133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21320013133 its reverse (33131002312), we get a palindrome (54451015445).

The spelling of 21320013133 in words is "twenty-one billion, three hundred twenty million, thirteen thousand, one hundred thirty-three".