21683566794 has 8 divisors (see below), whose sum is σ = 43367133600. Its totient is φ = 7227855596.

The previous prime is 21683566789. The next prime is 21683566811. The reversal of 21683566794 is 49766538612.

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

21683566794 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806963894 + ... + 1806963905.

It is an arithmetic number, because the mean of its divisors is an integer number (5420891700).

Almost surely, 2^21683566794 is an apocalyptic number.

21683566794 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21683566794 is a wasteful number, since it uses less digits than its factorization.

21683566794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3613927804.

The product of its digits is 13063680, while the sum is 57.

The spelling of 21683566794 in words is "twenty-one billion, six hundred eighty-three million, five hundred sixty-six thousand, seven hundred ninety-four".