21344304 has 40 divisors (see below), whose sum is σ = 55924992. Its totient is φ = 7013440.

The previous prime is 21344273. The next prime is 21344311. The reversal of 21344304 is 40344312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277 + ... + 6539.

Almost surely, 2^21344304 is an apocalyptic number.

21344304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21344304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27962496).

21344304 is an abundant number, since it is smaller than the sum of its proper divisors (34580688).

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

21344304 is a wasteful number, since it uses less digits than its factorization.

21344304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6345 (or 6339 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 21344304 is about 4619.9896103779. The cubic root of 21344304 is about 277.3920430646.

Adding to 21344304 its reverse (40344312), we get a palindrome (61688616).

The spelling of 21344304 in words is "twenty-one million, three hundred forty-four thousand, three hundred four".