21783484906 has 16 divisors (see below), whose sum is σ = 32789514240.
Its totient is φ = 10853670960.
The previous prime is 21783484903. The next prime is 21783484907. The reversal of 21783484906 is 60948438712.
It is not an unprimeable number, because it can be changed into a prime (21783484903) 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, 3470551 + ... + 3476821.
It is an arithmetic number, because the mean of its divisors is an integer number (2049344640).
Almost surely, 221783484906 is an apocalyptic number.
21783484906 is a deficient number, since it is larger than the sum of its proper divisors (11006029334).
21783484906 is a wasteful number, since it uses less digits than its factorization.
21783484906 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 12069.
The product of its (nonzero) digits is 2322432, while the sum is 52.
The spelling of 21783484906 in words is "twenty-one billion, seven hundred eighty-three million, four hundred eighty-four thousand, nine hundred six".