21254304 has 24 divisors (see below), whose sum is σ = 55792800. Its totient is φ = 7084736.

The previous prime is 21254297. The next prime is 21254309. The reversal of 21254304 is 40345212.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21254309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110604 + ... + 110795.

It is an arithmetic number, because the mean of its divisors is an integer number (2324700).

Almost surely, 2^21254304 is an apocalyptic number.

21254304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21254304 is an abundant number, since it is smaller than the sum of its proper divisors (34538496).

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

21254304 is a wasteful number, since it uses less digits than its factorization.

21254304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221412 (or 221404 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 21254304 is about 4610.2390393558. The cubic root of 21254304 is about 277.0016117237.

Adding to 21254304 its reverse (40345212), we get a palindrome (61599516).

The spelling of 21254304 in words is "twenty-one million, two hundred fifty-four thousand, three hundred four".