21327799 has 4 divisors (see below), whose sum is σ = 21904264. Its totient is φ = 20751336.

The previous prime is 21327797. The next prime is 21327821. The reversal of 21327799 is 99772312.

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 21327799 - 2¹ = 21327797 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 (21327791) 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, 288177 + ... + 288250.

It is an arithmetic number, because the mean of its divisors is an integer number (5476066).

Almost surely, 2^21327799 is an apocalyptic number.

21327799 is a deficient number, since it is larger than the sum of its proper divisors (576465).

21327799 is an equidigital number, since it uses as much as digits as its factorization.

21327799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576464.

The product of its digits is 47628, while the sum is 40.

The square root of 21327799 is about 4618.2030054990. The cubic root of 21327799 is about 277.3205245885.

The spelling of 21327799 in words is "twenty-one million, three hundred twenty-seven thousand, seven hundred ninety-nine".