27981321 has 8 divisors (see below), whose sum is σ = 37366560. Its totient is φ = 18625152.

The previous prime is 27981301. The next prime is 27981353. The reversal of 27981321 is 12318972.

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

It is not a de Polignac number, because 27981321 - 2¹⁰ = 27980297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27981301) 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, 4911 + ... + 8948.

It is an arithmetic number, because the mean of its divisors is an integer number (4670820).

Almost surely, 2^27981321 is an apocalyptic number.

It is an amenable number.

27981321 is a deficient number, since it is larger than the sum of its proper divisors (9385239).

27981321 is a wasteful number, since it uses less digits than its factorization.

27981321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14535.

The product of its digits is 6048, while the sum is 33.

The square root of 27981321 is about 5289.7373280722. The cubic root of 27981321 is about 303.5913578269.

The spelling of 27981321 in words is "twenty-seven million, nine hundred eighty-one thousand, three hundred twenty-one".