21107024717 has 2 divisors, whose sum is σ = 21107024718. Its totient is φ = 21107024716.

The previous prime is 21107024693. The next prime is 21107024801. The reversal of 21107024717 is 71742070112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12235456996 + 8871567721 = 110614^2 + 94189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21107024717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21107024117) 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, 10553512358 + 10553512359.

It is an arithmetic number, because the mean of its divisors is an integer number (10553512359).

Almost surely, 2^21107024717 is an apocalyptic number.

It is an amenable number.

21107024717 is a deficient number, since it is larger than the sum of its proper divisors (1).

21107024717 is an equidigital number, since it uses as much as digits as its factorization.

21107024717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 32.

Adding to 21107024717 its reverse (71742070112), we get a palindrome (92849094829).

The spelling of 21107024717 in words is "twenty-one billion, one hundred seven million, twenty-four thousand, seven hundred seventeen".