27115721 has 2 divisors, whose sum is σ = 27115722. Its totient is φ = 27115720.

The previous prime is 27115691. The next prime is 27115727. The reversal of 27115721 is 12751172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26574025 + 541696 = 5155^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 27115721 - 2¹⁴ = 27099337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27115727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13557860 + 13557861.

It is an arithmetic number, because the mean of its divisors is an integer number (13557861).

Almost surely, 2^27115721 is an apocalyptic number.

It is an amenable number.

27115721 is a deficient number, since it is larger than the sum of its proper divisors (1).

27115721 is an equidigital number, since it uses as much as digits as its factorization.

27115721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 980, while the sum is 26.

The square root of 27115721 is about 5207.2757752975. The cubic root of 27115721 is about 300.4279854342.

Adding to 27115721 its reverse (12751172), we get a palindrome (39866893).

The spelling of 27115721 in words is "twenty-seven million, one hundred fifteen thousand, seven hundred twenty-one".