21783484916 has 24 divisors (see below), whose sum is σ = 38224704000. Its totient is φ = 10862171424.

The previous prime is 21783484913. The next prime is 21783484927. The reversal of 21783484916 is 61948438712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21783484913) 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 in 7 ways as a sum of consecutive naturals, for example, 4574945 + ... + 4579703.

It is an arithmetic number, because the mean of its divisors is an integer number (1592696000).

Almost surely, 2^21783484916 is an apocalyptic number.

It is an amenable number.

21783484916 is a deficient number, since it is larger than the sum of its proper divisors (16441219084).

21783484916 is a wasteful number, since it uses less digits than its factorization.

21783484916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631 (or 7629 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 53.

The spelling of 21783484916 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred sixteen".