21384910 has 8 divisors (see below), whose sum is σ = 38492856. Its totient is φ = 8553960.

The previous prime is 21384907. The next prime is 21384931. The reversal of 21384910 is 1948312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 1069236 + ... + 1069255.

It is an arithmetic number, because the mean of its divisors is an integer number (4811607).

Almost surely, 2^21384910 is an apocalyptic number.

21384910 is a deficient number, since it is larger than the sum of its proper divisors (17107946).

21384910 is a wasteful number, since it uses less digits than its factorization.

21384910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138498.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21384910 is about 4624.3821208892. The cubic root of 21384910 is about 277.5678377558.

The spelling of 21384910 in words is "twenty-one million, three hundred eighty-four thousand, nine hundred ten".