21604738112 has 56 divisors (see below), whose sum is σ = 43952842752. Its totient is φ = 10530432000.

The previous prime is 21604738087. The next prime is 21604738171. The reversal of 21604738112 is 21183740612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4361237 + ... + 4366187.

It is an arithmetic number, because the mean of its divisors is an integer number (784872192).

Almost surely, 2^21604738112 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 21604738112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21976421376).

21604738112 is an abundant number, since it is smaller than the sum of its proper divisors (22348104640).

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

21604738112 is a wasteful number, since it uses less digits than its factorization.

21604738112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667 (or 6657 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 21604738112 in words is "twenty-one billion, six hundred four million, seven hundred thirty-eight thousand, one hundred twelve".