21302732736 has 84 divisors (see below), whose sum is σ = 61398088024. Its totient is φ = 7061644800.

The previous prime is 21302732729. The next prime is 21302732771. The reversal of 21302732736 is 63723720312.

21302732736 is a `hidden beast` number, since 21 + 302 + 7 + 327 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21302732736.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2091 + ... + 206421.

Almost surely, 2^21302732736 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 21302732736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30699044012).

21302732736 is an abundant number, since it is smaller than the sum of its proper divisors (40095355288).

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

21302732736 is a wasteful number, since it uses less digits than its factorization.

21302732736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204530 (or 204517 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 36.

The spelling of 21302732736 in words is "twenty-one billion, three hundred two million, seven hundred thirty-two thousand, seven hundred thirty-six".