27156321 has 6 divisors (see below), whose sum is σ = 39225810. Its totient is φ = 18104208.

The previous prime is 27156317. The next prime is 27156323. The reversal of 27156321 is 12365172.

It is a happy number.

27156321 is a `hidden beast` number, since 27 + 1 + 5 + 632 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22896225 + 4260096 = 4785^2 + 2064^2 .

It is not a de Polignac number, because 27156321 - 2² = 27156317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27156323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1508676 + ... + 1508693.

It is an arithmetic number, because the mean of its divisors is an integer number (6537635).

Almost surely, 2^27156321 is an apocalyptic number.

It is an amenable number.

27156321 is a deficient number, since it is larger than the sum of its proper divisors (12069489).

27156321 is a wasteful number, since it uses less digits than its factorization.

27156321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017375 (or 3017372 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 27156321 is about 5211.1727087096. The cubic root of 27156321 is about 300.5778529054.

The spelling of 27156321 in words is "twenty-seven million, one hundred fifty-six thousand, three hundred twenty-one".