21783206912 has 44 divisors (see below), whose sum is σ = 44366858136. Its totient is φ = 10686074880.

The previous prime is 21783206909. The next prime is 21783206927. The reversal of 21783206912 is 21960238712.

It is a self number, because there is not a number n which added to its sum of digits gives 21783206912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146414 + ... + 254957.

Almost surely, 2^21783206912 is an apocalyptic number.

It is an amenable number.

21783206912 is an abundant number, since it is smaller than the sum of its proper divisors (22583651224).

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

21783206912 is an equidigital number, since it uses as much as digits as its factorization.

21783206912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401444 (or 401426 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21783206912 in words is "twenty-one billion, seven hundred eighty-three million, two hundred six thousand, nine hundred twelve".