21304314 has 24 divisors (see below), whose sum is σ = 46611552. Its totient is φ = 7031880.

The previous prime is 21304291. The next prime is 21304319. The reversal of 21304314 is 41340312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21304319) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3892 + ... + 7599.

It is an arithmetic number, because the mean of its divisors is an integer number (1942148).

Almost surely, 2^21304314 is an apocalyptic number.

21304314 is an abundant number, since it is smaller than the sum of its proper divisors (25307238).

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

21304314 is a wasteful number, since it uses less digits than its factorization.

21304314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11602 (or 11599 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21304314 is about 4615.6596494976. The cubic root of 21304314 is about 277.2186971640.

Adding to 21304314 its reverse (41340312), we get a palindrome (62644626).

The spelling of 21304314 in words is "twenty-one million, three hundred four thousand, three hundred fourteen".