21230323133 has 2 divisors, whose sum is σ = 21230323134. Its totient is φ = 21230323132.

The previous prime is 21230323117. The next prime is 21230323139. The reversal of 21230323133 is 33132303212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16397570809 + 4832752324 = 128053^2 + 69518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230323133 - 2⁴ = 21230323117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230323099 and 21230323108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230323139) 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, 10615161566 + 10615161567.

It is an arithmetic number, because the mean of its divisors is an integer number (10615161567).

Almost surely, 2^21230323133 is an apocalyptic number.

It is an amenable number.

21230323133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230323133 is an equidigital number, since it uses as much as digits as its factorization.

21230323133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21230323133 its reverse (33132303212), we get a palindrome (54362626345).

The spelling of 21230323133 in words is "twenty-one billion, two hundred thirty million, three hundred twenty-three thousand, one hundred thirty-three".