21108960 has 144 divisors (see below), whose sum is σ = 73238256. Its totient is φ = 5535744.

The previous prime is 21108929. The next prime is 21108977. The reversal of 21108960 is 6980112.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154012 + ... + 154148.

It is an arithmetic number, because the mean of its divisors is an integer number (508599).

Almost surely, 2^21108960 is an apocalyptic number.

21108960 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 21108960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36619128).

21108960 is an abundant number, since it is smaller than the sum of its proper divisors (52129296).

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

21108960 is a wasteful number, since it uses less digits than its factorization.

21108960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 21108960 is about 4594.4488243967. The cubic root of 21108960 is about 276.3687572500.

The spelling of 21108960 in words is "twenty-one million, one hundred eight thousand, nine hundred sixty".