21434304 has 28 divisors (see below), whose sum is σ = 56712104. Its totient is φ = 7144704.

The previous prime is 21434293. The next prime is 21434323. The reversal of 21434304 is 40343412.

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 3 ways as a sum of consecutive naturals, for example, 55627 + ... + 56010.

Almost surely, 2^21434304 is an apocalyptic number.

21434304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21434304 is an abundant number, since it is smaller than the sum of its proper divisors (35277800).

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

21434304 is a wasteful number, since it uses less digits than its factorization.

21434304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111652 (or 111642 counting only the distinct ones).

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

The square root of 21434304 is about 4629.7196459397. The cubic root of 21434304 is about 277.7813784185.

Adding to 21434304 its reverse (40343412), we get a palindrome (61777716).

The spelling of 21434304 in words is "twenty-one million, four hundred thirty-four thousand, three hundred four".