27117921 has 8 divisors (see below), whose sum is σ = 38060320. Its totient is φ = 17127072.

The previous prime is 27117913. The next prime is 27117947. The reversal of 27117921 is 12971172.

It is a happy number.

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

It is not a de Polignac number, because 27117921 - 2³ = 27117913 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27117911) 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, 237820 + ... + 237933.

It is an arithmetic number, because the mean of its divisors is an integer number (4757540).

Almost surely, 2^27117921 is an apocalyptic number.

It is an amenable number.

27117921 is a deficient number, since it is larger than the sum of its proper divisors (10942399).

27117921 is a wasteful number, since it uses less digits than its factorization.

27117921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475775.

The product of its digits is 1764, while the sum is 30.

The square root of 27117921 is about 5207.4870139060. The cubic root of 27117921 is about 300.4361101637.

The spelling of 27117921 in words is "twenty-seven million, one hundred seventeen thousand, nine hundred twenty-one".