21204607600 has 240 divisors, whose sum is σ = 58090281984. Its totient is φ = 7368192000.

The previous prime is 21204607577. The next prime is 21204607663. The reversal of 21204607600 is 670640212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11320264 + ... + 11322136.

Almost surely, 2^21204607600 is an apocalyptic number.

21204607600 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 21204607600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29045140992).

21204607600 is an abundant number, since it is smaller than the sum of its proper divisors (36885674384).

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

21204607600 is a wasteful number, since it uses less digits than its factorization.

21204607600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2016 (or 2005 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 21204607600 in words is "twenty-one billion, two hundred four million, six hundred seven thousand, six hundred".