21608200908 has 216 divisors, whose sum is σ = 69792952320. Its totient is φ = 5594339520.

The previous prime is 21608200907. The next prime is 21608200919. The reversal of 21608200908 is 80900280612.

21608200908 is a `hidden beast` number, since 21 + 608 + 20 + 0 + 9 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21608200907) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 756853 + ... + 784883.

It is an arithmetic number, because the mean of its divisors is an integer number (323115520).

Almost surely, 2^21608200908 is an apocalyptic number.

21608200908 is a gapful number since it is divisible by the number (28) 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 21608200908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34896476160).

21608200908 is an abundant number, since it is smaller than the sum of its proper divisors (48184751412).

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

21608200908 is a wasteful number, since it uses less digits than its factorization.

21608200908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28097 (or 28085 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 21608200908 in words is "twenty-one billion, six hundred eight million, two hundred thousand, nine hundred eight".