21788730336 has 48 divisors (see below), whose sum is σ = 57269603664. Its totient is φ = 7253489664.

The previous prime is 21788730319. The next prime is 21788730343. The reversal of 21788730336 is 63303788712.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72601 + ... + 221016.

It is an arithmetic number, because the mean of its divisors is an integer number (1193116743).

Almost surely, 2^21788730336 is an apocalyptic number.

It is an amenable number.

21788730336 is an abundant number, since it is smaller than the sum of its proper divisors (35480873328).

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

21788730336 is a wasteful number, since it uses less digits than its factorization.

21788730336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294403 (or 294395 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The spelling of 21788730336 in words is "twenty-one billion, seven hundred eighty-eight million, seven hundred thirty thousand, three hundred thirty-six".