21608863345 has 8 divisors (see below), whose sum is σ = 25956650664. Its totient is φ = 17269747584.

The previous prime is 21608863301. The next prime is 21608863369. The reversal of 21608863345 is 54336880612.

It can be written as a sum of positive squares in 4 ways, for example, as 6443433441 + 15165429904 = 80271^2 + 123148^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21608863345 - 2¹¹ = 21608861297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21608863295 and 21608863304.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2162404 + ... + 2172373.

It is an arithmetic number, because the mean of its divisors is an integer number (3244581333).

Almost surely, 2^21608863345 is an apocalyptic number.

It is an amenable number.

21608863345 is a deficient number, since it is larger than the sum of its proper divisors (4347787319).

21608863345 is an equidigital number, since it uses as much as digits as its factorization.

21608863345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4335779.

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 21608863345 in words is "twenty-one billion, six hundred eight million, eight hundred sixty-three thousand, three hundred forty-five".