21783929364 has 36 divisors (see below), whose sum is σ = 55106737140. Its totient is φ = 7255797120.

The previous prime is 21783929359. The next prime is 21783929389. The reversal of 21783929364 is 46392938712.

21783929364 is a `hidden beast` number, since 217 + 8 + 392 + 9 + 36 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8297752464 + 13486176900 = 91092^2 + 116130^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21783929364.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181479 + ... + 276590.

Almost surely, 2^21783929364 is an apocalyptic number.

It is an amenable number.

21783929364 is an abundant number, since it is smaller than the sum of its proper divisors (33322807776).

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

21783929364 is a wasteful number, since it uses less digits than its factorization.

21783929364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459400 (or 459395 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 21783929364 in words is "twenty-one billion, seven hundred eighty-three million, nine hundred twenty-nine thousand, three hundred sixty-four".