27081421 has 2 divisors, whose sum is σ = 27081422. Its totient is φ = 27081420.

The previous prime is 27081407. The next prime is 27081449. The reversal of 27081421 is 12418072.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21855625 + 5225796 = 4675^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 27081421 - 2⁷ = 27081293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27081451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13540710 + 13540711.

It is an arithmetic number, because the mean of its divisors is an integer number (13540711).

Almost surely, 2^27081421 is an apocalyptic number.

It is an amenable number.

27081421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27081421 is an equidigital number, since it uses as much as digits as its factorization.

27081421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 27081421 is about 5203.9812643783. The cubic root of 27081421 is about 300.3012566395.

Adding to 27081421 its reverse (12418072), we get a palindrome (39499493).

The spelling of 27081421 in words is "twenty-seven million, eighty-one thousand, four hundred twenty-one".