21327279 has 8 divisors (see below), whose sum is σ = 29672832. Its totient is φ = 13599960.

The previous prime is 21327263. The next prime is 21327289. The reversal of 21327279 is 97272312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21327279 - 2⁴ = 21327263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21327259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154477 + ... + 154614.

It is an arithmetic number, because the mean of its divisors is an integer number (3709104).

Almost surely, 2^21327279 is an apocalyptic number.

21327279 is a deficient number, since it is larger than the sum of its proper divisors (8345553).

21327279 is a wasteful number, since it uses less digits than its factorization.

21327279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309117.

The product of its digits is 10584, while the sum is 33.

The square root of 21327279 is about 4618.1467062015. The cubic root of 21327279 is about 277.3182707562.

The spelling of 21327279 in words is "twenty-one million, three hundred twenty-seven thousand, two hundred seventy-nine".