21603748608 has 324 divisors, whose sum is σ = 68184442872. Its totient is φ = 6575063040.

The previous prime is 21603748561. The next prime is 21603748643. The reversal of 21603748608 is 80684730612.

21603748608 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 37 + 4 + 8 + 608 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 43999243 + ... + 43999733.

Almost surely, 2^21603748608 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 21603748608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34092221436).

21603748608 is an abundant number, since it is smaller than the sum of its proper divisors (46580694264).

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

21603748608 is a wasteful number, since it uses less digits than its factorization.

21603748608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 21603748608 in words is "twenty-one billion, six hundred three million, seven hundred forty-eight thousand, six hundred eight".