21230323253 has 2 divisors, whose sum is σ = 21230323254. Its totient is φ = 21230323252.

The previous prime is 21230323237. The next prime is 21230323319. The reversal of 21230323253 is 35232303212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16471668964 + 4758654289 = 128342^2 + 68983^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230323253 - 2⁴ = 21230323237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230373253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615161626 + 10615161627.

It is an arithmetic number, because the mean of its divisors is an integer number (10615161627).

Almost surely, 2^21230323253 is an apocalyptic number.

It is an amenable number.

21230323253 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230323253 is an equidigital number, since it uses as much as digits as its factorization.

21230323253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 21230323253 its reverse (35232303212), we get a palindrome (56462626465).

The spelling of 21230323253 in words is "twenty-one billion, two hundred thirty million, three hundred twenty-three thousand, two hundred fifty-three".