21304327 has 4 divisors (see below), whose sum is σ = 23241096. Its totient is φ = 19367560.

The previous prime is 21304321. The next prime is 21304333. The reversal of 21304327 is 72340312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21304321) and next prime (21304333).

It is a cyclic number.

It is not a de Polignac number, because 21304327 - 2³ = 21304319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304298 and 21304307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 968368 + ... + 968389.

It is an arithmetic number, because the mean of its divisors is an integer number (5810274).

Almost surely, 2^21304327 is an apocalyptic number.

21304327 is a deficient number, since it is larger than the sum of its proper divisors (1936769).

21304327 is a wasteful number, since it uses less digits than its factorization.

21304327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936768.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21304327 is about 4615.6610577468. The cubic root of 21304327 is about 277.2187535508.

Adding to 21304327 its reverse (72340312), we get a palindrome (93644639).

The spelling of 21304327 in words is "twenty-one million, three hundred four thousand, three hundred twenty-seven".