21424800664129 has 2 divisors, whose sum is σ = 21424800664130. Its totient is φ = 21424800664128.

The previous prime is 21424800664109. The next prime is 21424800664177. The reversal of 21424800664129 is 92146600842412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20733242104129 + 691558560000 = 4553377^2 + 831600^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424800664129 - 2¹¹ = 21424800662081 is a prime.

It is not a weakly prime, because it can be changed into another prime (21424800664109) 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, 10712400332064 + 10712400332065.

It is an arithmetic number, because the mean of its divisors is an integer number (10712400332065).

Almost surely, 2^{21424800664129} is an apocalyptic number.

It is an amenable number.

21424800664129 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424800664129 is an equidigital number, since it uses as much as digits as its factorization.

21424800664129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 21424800664129 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, one hundred twenty-nine".