21608484 has 12 divisors (see below), whose sum is σ = 50419824. Its totient is φ = 7202824.

The previous prime is 21608467. The next prime is 21608497. The reversal of 21608484 is 48480612.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 900342 + ... + 900365.

It is an arithmetic number, because the mean of its divisors is an integer number (4201652).

Almost surely, 2^21608484 is an apocalyptic number.

It is an amenable number.

21608484 is an abundant number, since it is smaller than the sum of its proper divisors (28811340).

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

21608484 is a wasteful number, since it uses less digits than its factorization.

21608484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1800714 (or 1800712 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 21608484 is about 4648.4926589164. The cubic root of 21608484 is about 278.5317875029.

The spelling of 21608484 in words is "twenty-one million, six hundred eight thousand, four hundred eighty-four".