21788537092 has 12 divisors (see below), whose sum is σ = 43577074240. Its totient is φ = 9337944456.

The previous prime is 21788537083. The next prime is 21788537119. The reversal of 21788537092 is 29073588712.

21788537092 is an admirable number.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 389080992 + ... + 389081047.

Almost surely, 2^21788537092 is an apocalyptic number.

It is an amenable number.

21788537092 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21788537092 is a wasteful number, since it uses less digits than its factorization.

21788537092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778162050 (or 778162048 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 21788537092 in words is "twenty-one billion, seven hundred eighty-eight million, five hundred thirty-seven thousand, ninety-two".