21068408863 has 4 divisors (see below), whose sum is σ = 21365147088. Its totient is φ = 20771670640.

The previous prime is 21068408849. The next prime is 21068408899. The reversal of 21068408863 is 36880486012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21068408863 - 2²¹ = 21066311711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21068408813) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 148369006 + ... + 148369147.

It is an arithmetic number, because the mean of its divisors is an integer number (5341286772).

Almost surely, 2^21068408863 is an apocalyptic number.

21068408863 is a deficient number, since it is larger than the sum of its proper divisors (296738225).

21068408863 is an equidigital number, since it uses as much as digits as its factorization.

21068408863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296738224.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 21068408863 in words is "twenty-one billion, sixty-eight million, four hundred eight thousand, eight hundred sixty-three".