21707748036 has 192 divisors, whose sum is σ = 63402393600. Its totient is φ = 6372888192.

The previous prime is 21707748031. The next prime is 21707748053. The reversal of 21707748036 is 63084770712.

21707748036 is a `hidden beast` number, since 2 + 1 + 70 + 77 + 480 + 36 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21707747982 and 21707748000.

It is not an unprimeable number, because it can be changed into a prime (21707748031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20892405 + ... + 20893443.

It is an arithmetic number, because the mean of its divisors is an integer number (330220800).

Almost surely, 2^21707748036 is an apocalyptic number.

21707748036 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21707748036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31701196800).

21707748036 is an abundant number, since it is smaller than the sum of its proper divisors (41694645564).

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

21707748036 is a wasteful number, since it uses less digits than its factorization.

21707748036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735 (or 1727 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 21707748036 in words is "twenty-one billion, seven hundred seven million, seven hundred forty-eight thousand, thirty-six".