27121218 has 32 divisors (see below), whose sum is σ = 57311232. Its totient is φ = 8542800.

The previous prime is 27121217. The next prime is 27121223. The reversal of 27121218 is 81212172.

27121218 = 47² + 48² + ... + 433².

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27121217) 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 15 ways as a sum of consecutive naturals, for example, 6303 + ... + 9693.

It is an arithmetic number, because the mean of its divisors is an integer number (1790976).

Almost surely, 2^27121218 is an apocalyptic number.

27121218 is an abundant number, since it is smaller than the sum of its proper divisors (30190014).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27121218 is a wasteful number, since it uses less digits than its factorization.

27121218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470.

The product of its digits is 448, while the sum is 24.

The square root of 27121218 is about 5207.8035677241. The cubic root of 27121218 is about 300.4482853560.

The spelling of 27121218 in words is "twenty-seven million, one hundred twenty-one thousand, two hundred eighteen".