21304514 has 24 divisors (see below), whose sum is σ = 40555728. Its totient is φ = 8300040.

The previous prime is 21304511. The next prime is 21304537. The reversal of 21304514 is 41540312.

It is not an unprimeable number, because it can be changed into a prime (21304511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8804 + ... + 10959.

It is an arithmetic number, because the mean of its divisors is an integer number (1689822).

Almost surely, 2^21304514 is an apocalyptic number.

21304514 is a deficient number, since it is larger than the sum of its proper divisors (19251214).

21304514 is a wasteful number, since it uses less digits than its factorization.

21304514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19790 (or 19783 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 21304514 is about 4615.6813148223. The cubic root of 21304514 is about 277.2195646498.

Adding to 21304514 its reverse (41540312), we get a palindrome (62844826).

The spelling of 21304514 in words is "twenty-one million, three hundred four thousand, five hundred fourteen".