27540421 has 2 divisors, whose sum is σ = 27540422. Its totient is φ = 27540420.

The previous prime is 27540413. The next prime is 27540467. The reversal of 27540421 is 12404572.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24117921 + 3422500 = 4911^2 + 1850^2 .

It is a cyclic number.

It is not a de Polignac number, because 27540421 - 2³ = 27540413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27543421) 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 as a sum of consecutive naturals, namely, 13770210 + 13770211.

It is an arithmetic number, because the mean of its divisors is an integer number (13770211).

Almost surely, 2^27540421 is an apocalyptic number.

It is an amenable number.

27540421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27540421 is an equidigital number, since it uses as much as digits as its factorization.

27540421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 27540421 is about 5247.8968168210. The cubic root of 27540421 is about 301.9883516698.

Adding to 27540421 its reverse (12404572), we get a palindrome (39944993).

The spelling of 27540421 in words is "twenty-seven million, five hundred forty thousand, four hundred twenty-one".