21783980736 has 336 divisors, whose sum is σ = 74015518720. Its totient is φ = 5994362880.

The previous prime is 21783980711. The next prime is 21783980753. The reversal of 21783980736 is 63708938712.

21783980736 is a `hidden beast` number, since 217 + 8 + 398 + 0 + 7 + 36 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49621605 + ... + 49622043.

Almost surely, 2^21783980736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21783980736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37007759360).

21783980736 is an abundant number, since it is smaller than the sum of its proper divisors (52231537984).

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

21783980736 is a wasteful number, since it uses less digits than its factorization.

21783980736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 879 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21783980736 in words is "twenty-one billion, seven hundred eighty-three million, nine hundred eighty thousand, seven hundred thirty-six".