27316721 has 2 divisors, whose sum is σ = 27316722. Its totient is φ = 27316720.

The previous prime is 27316717. The next prime is 27316727. The reversal of 27316721 is 12761372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13957696 + 13359025 = 3736^2 + 3655^2 .

It is a cyclic number.

It is not a de Polignac number, because 27316721 - 2² = 27316717 is a prime.

It is not a weakly prime, because it can be changed into another prime (27316727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13658360 + 13658361.

It is an arithmetic number, because the mean of its divisors is an integer number (13658361).

Almost surely, 2^27316721 is an apocalyptic number.

It is an amenable number.

27316721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27316721 is an equidigital number, since it uses as much as digits as its factorization.

27316721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 29.

The square root of 27316721 is about 5226.5400601163. The cubic root of 27316721 is about 301.1684836517.

The spelling of 27316721 in words is "twenty-seven million, three hundred sixteen thousand, seven hundred twenty-one".