21703688740 has 48 divisors (see below), whose sum is σ = 47242666800. Its totient is φ = 8365532672.

The previous prime is 21703688731. The next prime is 21703688777. The reversal of 21703688740 is 4788630712.

It can be written as a sum of positive squares in 8 ways, for example, as 2947838436 + 18755850304 = 54294^2 + 136952^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258462 + ... + 331978.

It is an arithmetic number, because the mean of its divisors is an integer number (984222225).

Almost surely, 2^21703688740 is an apocalyptic number.

21703688740 is a gapful number since it is divisible by the number (20) 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 21703688740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23621333400).

21703688740 is an abundant number, since it is smaller than the sum of its proper divisors (25538978060).

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

21703688740 is a wasteful number, since it uses less digits than its factorization.

21703688740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74064 (or 74062 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 21703688740 in words is "twenty-one billion, seven hundred three million, six hundred eighty-eight thousand, seven hundred forty".