21364384 has 24 divisors (see below), whose sum is σ = 42203700. Its totient is φ = 10646016.

The previous prime is 21364373. The next prime is 21364411. The reversal of 21364384 is 48346312.

It can be written as a sum of positive squares in 2 ways, for example, as 19114384 + 2250000 = 4372^2 + 1500^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10212 + ... + 12124.

Almost surely, 2^21364384 is an apocalyptic number.

It is an amenable number.

21364384 is a deficient number, since it is larger than the sum of its proper divisors (20839316).

21364384 is a wasteful number, since it uses less digits than its factorization.

21364384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2272 (or 2264 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 21364384 is about 4622.1622645684. The cubic root of 21364384 is about 277.4790028211.

The spelling of 21364384 in words is "twenty-one million, three hundred sixty-four thousand, three hundred eighty-four".