21330312008129 has 2 divisors, whose sum is σ = 21330312008130. Its totient is φ = 21330312008128.

The previous prime is 21330312008099. The next prime is 21330312008221. The reversal of 21330312008129 is 92180021303312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16654887481600 + 4675424526529 = 4081040^2 + 2162273^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330312008129 - 2¹⁶ = 21330311942593 is a prime.

It is not a weakly prime, because it can be changed into another prime (21330312098129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665156004064 + 10665156004065.

It is an arithmetic number, because the mean of its divisors is an integer number (10665156004065).

Almost surely, 2^{21330312008129} is an apocalyptic number.

It is an amenable number.

21330312008129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330312008129 is an equidigital number, since it uses as much as digits as its factorization.

21330312008129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21330312008129 in words is "twenty-one trillion, three hundred thirty billion, three hundred twelve million, eight thousand, one hundred twenty-nine".