21424804608373 has 2 divisors, whose sum is σ = 21424804608374. Its totient is φ = 21424804608372.

The previous prime is 21424804608281. The next prime is 21424804608379. The reversal of 21424804608373 is 37380640842412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15571492121329 + 5853312487044 = 3946073^2 + 2419362^2 .

It is a cyclic number.

It is not a de Polignac number, because 21424804608373 - 2⁹ = 21424804607861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21424804608373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21424804608379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712402304186 + 10712402304187.

It is an arithmetic number, because the mean of its divisors is an integer number (10712402304187).

Almost surely, 2^{21424804608373} is an apocalyptic number.

It is an amenable number.

21424804608373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424804608373 is an equidigital number, since it uses as much as digits as its factorization.

21424804608373 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6193152, while the sum is 52.

The spelling of 21424804608373 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred eight thousand, three hundred seventy-three".