21424800664193 has 2 divisors, whose sum is σ = 21424800664194. Its totient is φ = 21424800664192.

The previous prime is 21424800664181. The next prime is 21424800664243. The reversal of 21424800664193 is 39146600842412.

It is an a-pointer prime, because the next prime (21424800664243) can be obtained adding 21424800664193 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21151472459329 + 273328204864 = 4599073^2 + 522808^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424800664193 - 2⁴ = 21424800664177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21424800664093) 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, 10712400332096 + 10712400332097.

It is an arithmetic number, because the mean of its divisors is an integer number (10712400332097).

Almost surely, 2^{21424800664193} is an apocalyptic number.

It is an amenable number.

21424800664193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424800664193 is an equidigital number, since it uses as much as digits as its factorization.

21424800664193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 21424800664193 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred million, six hundred sixty-four thousand, one hundred ninety-three".