27429221 has 2 divisors, whose sum is σ = 27429222. Its totient is φ = 27429220.

The previous prime is 27429169. The next prime is 27429229. The reversal of 27429221 is 12292472.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15602500 + 11826721 = 3950^2 + 3439^2 .

It is a cyclic number.

It is not a de Polignac number, because 27429221 - 2¹⁴ = 27412837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27429229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13714610 + 13714611.

It is an arithmetic number, because the mean of its divisors is an integer number (13714611).

Almost surely, 2^27429221 is an apocalyptic number.

It is an amenable number.

27429221 is a deficient number, since it is larger than the sum of its proper divisors (1).

27429221 is an equidigital number, since it uses as much as digits as its factorization.

27429221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 27429221 is about 5237.2913800933. The cubic root of 27429221 is about 301.5813571266.

The spelling of 27429221 in words is "twenty-seven million, four hundred twenty-nine thousand, two hundred twenty-one".