21308425600 has 384 divisors, whose sum is σ = 69501265920. Its totient is φ = 6249676800.

The previous prime is 21308425597. The next prime is 21308425631. The reversal of 21308425600 is 652480312.

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, 4186257 + ... + 4191343.

It is an arithmetic number, because the mean of its divisors is an integer number (180992880).

Almost surely, 2^21308425600 is an apocalyptic number.

21308425600 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 21308425600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34750632960).

21308425600 is an abundant number, since it is smaller than the sum of its proper divisors (48192840320).

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

21308425600 is a wasteful number, since it uses less digits than its factorization.

21308425600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5146 (or 5129 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21308425600 in words is "twenty-one billion, three hundred eight million, four hundred twenty-five thousand, six hundred".