21783484904 has 16 divisors (see below), whose sum is σ = 40885016100. Its totient is φ = 10880813952.

The previous prime is 21783484903. The next prime is 21783484907. The reversal of 21783484904 is 40948438712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15499752004 + 6283732900 = 124498^2 + 79270^2 .

It is not an unprimeable number, because it can be changed into a prime (21783484903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1357589 + ... + 1373540.

Almost surely, 2^21783484904 is an apocalyptic number.

It is an amenable number.

21783484904 is a deficient number, since it is larger than the sum of its proper divisors (19101531196).

21783484904 is a wasteful number, since it uses less digits than its factorization.

21783484904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732132 (or 2732128 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The spelling of 21783484904 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred four".