27321721 has 8 divisors (see below), whose sum is σ = 31262144. Its totient is φ = 23390640.

The previous prime is 27321667. The next prime is 27321743. The reversal of 27321721 is 12712372.

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

It is not a de Polignac number, because 27321721 - 2⁹ = 27321209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27321121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5866 + ... + 9436.

It is an arithmetic number, because the mean of its divisors is an integer number (3907768).

Almost surely, 2^27321721 is an apocalyptic number.

It is an amenable number.

27321721 is a deficient number, since it is larger than the sum of its proper divisors (3940423).

27321721 is a wasteful number, since it uses less digits than its factorization.

27321721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4671.

The product of its digits is 1176, while the sum is 25.

The square root of 27321721 is about 5227.0183661434. The cubic root of 27321721 is about 301.1868576305.

The spelling of 27321721 in words is "twenty-seven million, three hundred twenty-one thousand, seven hundred twenty-one".