21327347 has 4 divisors (see below), whose sum is σ = 21526776. Its totient is φ = 21127920.

The previous prime is 21327343. The next prime is 21327353. The reversal of 21327347 is 74372312.

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

It is a cyclic number.

It is not a de Polignac number, because 21327347 - 2² = 21327343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21327343) 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, 99554 + ... + 99767.

It is an arithmetic number, because the mean of its divisors is an integer number (5381694).

Almost surely, 2^21327347 is an apocalyptic number.

21327347 is a deficient number, since it is larger than the sum of its proper divisors (199429).

21327347 is a wasteful number, since it uses less digits than its factorization.

21327347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199428.

The product of its digits is 7056, while the sum is 29.

The square root of 21327347 is about 4618.1540684564. The cubic root of 21327347 is about 277.3185654902.

Adding to 21327347 its reverse (74372312), we get a palindrome (95699659).

The spelling of 21327347 in words is "twenty-one million, three hundred twenty-seven thousand, three hundred forty-seven".