21324323129 has 2 divisors, whose sum is σ = 21324323130. Its totient is φ = 21324323128.

The previous prime is 21324323101. The next prime is 21324323149. The reversal of 21324323129 is 92132342312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21176943529 + 147379600 = 145523^2 + 12140^2 .

It is a cyclic number.

It is not a de Polignac number, because 21324323129 - 2¹² = 21324319033 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21324323095 and 21324323104.

It is not a weakly prime, because it can be changed into another prime (21324323149) 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, 10662161564 + 10662161565.

It is an arithmetic number, because the mean of its divisors is an integer number (10662161565).

Almost surely, 2^21324323129 is an apocalyptic number.

It is an amenable number.

21324323129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21324323129 is an equidigital number, since it uses as much as digits as its factorization.

21324323129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The spelling of 21324323129 in words is "twenty-one billion, three hundred twenty-four million, three hundred twenty-three thousand, one hundred twenty-nine".