27340921 has 2 divisors, whose sum is σ = 27340922. Its totient is φ = 27340920.

The previous prime is 27340897. The next prime is 27340949. The reversal of 27340921 is 12904372.

It is an a-pointer prime, because the next prime (27340949) can be obtained adding 27340921 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 10653696 = 4085^2 + 3264^2 .

It is a cyclic number.

It is not a de Polignac number, because 27340921 - 2⁹ = 27340409 is a prime.

It is a super-2 number, since 2×27340921² = 1495051922256482, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27340921.

It is not a weakly prime, because it can be changed into another prime (27940921) 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, 13670460 + 13670461.

It is an arithmetic number, because the mean of its divisors is an integer number (13670461).

Almost surely, 2^27340921 is an apocalyptic number.

It is an amenable number.

27340921 is a deficient number, since it is larger than the sum of its proper divisors (1).

27340921 is an equidigital number, since it uses as much as digits as its factorization.

27340921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 27340921 is about 5228.8546547021. The cubic root of 27340921 is about 301.2573928846.

It can be divided in two parts, 273409 and 21, that added together give a triangular number (273430 = T₇₃₉).

The spelling of 27340921 in words is "twenty-seven million, three hundred forty thousand, nine hundred twenty-one".