21327807 has 4 divisors (see below), whose sum is σ = 28437080. Its totient is φ = 14218536.

The previous prime is 21327797. The next prime is 21327821. The reversal of 21327807 is 70872312.

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

It is not a de Polignac number, because 21327807 - 2⁴ = 21327791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3554632 + ... + 3554637.

It is an arithmetic number, because the mean of its divisors is an integer number (7109270).

Almost surely, 2^21327807 is an apocalyptic number.

21327807 is a deficient number, since it is larger than the sum of its proper divisors (7109273).

21327807 is an equidigital number, since it uses as much as digits as its factorization.

21327807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7109272.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 21327807 is about 4618.2038716367. The cubic root of 21327807 is about 277.3205592625.

The spelling of 21327807 in words is "twenty-one million, three hundred twenty-seven thousand, eight hundred seven".