21868560017 has 16 divisors (see below), whose sum is σ = 23593248000. Its totient is φ = 20204392320.

The previous prime is 21868560013. The next prime is 21868560023. The reversal of 21868560017 is 71006586812.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21868560017 - 2² = 21868560013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21868560017.

It is not an unprimeable number, because it can be changed into a prime (21868560013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207359 + ... + 294507.

It is an arithmetic number, because the mean of its divisors is an integer number (1474578000).

Almost surely, 2^21868560017 is an apocalyptic number.

It is an amenable number.

21868560017 is a deficient number, since it is larger than the sum of its proper divisors (1724687983).

21868560017 is a wasteful number, since it uses less digits than its factorization.

21868560017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87496.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 21868560017 in words is "twenty-one billion, eight hundred sixty-eight million, five hundred sixty thousand, seventeen".