21424804608281 has 2 divisors, whose sum is σ = 21424804608282. Its totient is φ = 21424804608280.

The previous prime is 21424804608241. The next prime is 21424804608373. The reversal of 21424804608281 is 18280640842412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21217400875225 + 207403733056 = 4606235^2 + 455416^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21424804608281 is a prime.

It is a super-2 number, since 2×21424804608281² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21424804608241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10712402304140 + 10712402304141.

It is an arithmetic number, because the mean of its divisors is an integer number (10712402304141).

Almost surely, 2^{21424804608281} is an apocalyptic number.

It is an amenable number.

21424804608281 is a deficient number, since it is larger than the sum of its proper divisors (1).

21424804608281 is an equidigital number, since it uses as much as digits as its factorization.

21424804608281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1572864, while the sum is 50.

The spelling of 21424804608281 in words is "twenty-one trillion, four hundred twenty-four billion, eight hundred four million, six hundred eight thousand, two hundred eighty-one".