21084364 has 24 divisors (see below), whose sum is σ = 42801920. Its totient is φ = 8900496.

The previous prime is 21084317. The next prime is 21084377. The reversal of 21084364 is 46348012.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3744 + ... + 7495.

Almost surely, 2^21084364 is an apocalyptic number.

It is an amenable number.

21084364 is an abundant number, since it is smaller than the sum of its proper divisors (21717556).

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

21084364 is a wasteful number, since it uses less digits than its factorization.

21084364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11317 (or 11315 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 21084364 is about 4591.7713357701. The cubic root of 21084364 is about 276.2613746059.

The spelling of 21084364 in words is "twenty-one million, eighty-four thousand, three hundred sixty-four".