21794854559 has 2 divisors, whose sum is σ = 21794854560. Its totient is φ = 21794854558.

The previous prime is 21794854553. The next prime is 21794854589. The reversal of 21794854559 is 95545849712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21794854559 - 2¹² = 21794850463 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21794854498 and 21794854507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21794854553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10897427279 + 10897427280.

It is an arithmetic number, because the mean of its divisors is an integer number (10897427280).

Almost surely, 2^21794854559 is an apocalyptic number.

21794854559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21794854559 is an equidigital number, since it uses as much as digits as its factorization.

21794854559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144000, while the sum is 59.

The spelling of 21794854559 in words is "twenty-one billion, seven hundred ninety-four million, eight hundred fifty-four thousand, five hundred fifty-nine".