21084468 has 48 divisors (see below), whose sum is σ = 52039680. Its totient is φ = 6630624.

The previous prime is 21084463. The next prime is 21084521. The reversal of 21084468 is 86448012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21084461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21321 + ... + 22287.

It is an arithmetic number, because the mean of its divisors is an integer number (1084160).

Almost surely, 2^21084468 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21084468, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26019840).

21084468 is an abundant number, since it is smaller than the sum of its proper divisors (30955212).

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

21084468 is a wasteful number, since it uses less digits than its factorization.

21084468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076 (or 1074 counting only the distinct ones).

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

The square root of 21084468 is about 4591.7826603619. The cubic root of 21084468 is about 276.2618288309.

The spelling of 21084468 in words is "twenty-one million, eighty-four thousand, four hundred sixty-eight".