27118921 has 2 divisors, whose sum is σ = 27118922. Its totient is φ = 27118920.

The previous prime is 27118919. The next prime is 27118933. The reversal of 27118921 is 12981172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 26896 = 5205^2 + 164^2 .

It is a cyclic number.

It is not a de Polignac number, because 27118921 - 2¹ = 27118919 is a prime.

Together with 27118919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27118901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13559460 + 13559461.

It is an arithmetic number, because the mean of its divisors is an integer number (13559461).

Almost surely, 2^27118921 is an apocalyptic number.

It is an amenable number.

27118921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27118921 is an equidigital number, since it uses as much as digits as its factorization.

27118921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 27118921 is about 5207.5830286228. The cubic root of 27118921 is about 300.4398030773.

The spelling of 27118921 in words is "twenty-seven million, one hundred eighteen thousand, nine hundred twenty-one".