21084648 has 32 divisors (see below), whose sum is σ = 56767200. Its totient is φ = 6487488.

The previous prime is 21084643. The next prime is 21084649. The reversal of 21084648 is 84648012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33478 + ... + 34101.

It is an arithmetic number, because the mean of its divisors is an integer number (1773975).

Almost surely, 2^21084648 is an apocalyptic number.

It is an amenable number.

21084648 is an abundant number, since it is smaller than the sum of its proper divisors (35682552).

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

21084648 is a wasteful number, since it uses less digits than its factorization.

21084648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67601 (or 67597 counting only the distinct ones).

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

The square root of 21084648 is about 4591.8022605509. The cubic root of 21084648 is about 276.2626149860.

The spelling of 21084648 in words is "twenty-one million, eighty-four thousand, six hundred forty-eight".