27321421 has 2 divisors, whose sum is σ = 27321422. Its totient is φ = 27321420.

The previous prime is 27321403. The next prime is 27321517. The reversal of 27321421 is 12412372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 3944196 = 4835^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 27321421 - 2⁵ = 27321389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27321392 and 27321401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27321121) 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, 13660710 + 13660711.

It is an arithmetic number, because the mean of its divisors is an integer number (13660711).

Almost surely, 2^27321421 is an apocalyptic number.

It is an amenable number.

27321421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27321421 is an equidigital number, since it uses as much as digits as its factorization.

27321421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 22.

The square root of 27321421 is about 5226.9896690160. The cubic root of 27321421 is about 301.1857552550.

Adding to 27321421 its reverse (12412372), we get a palindrome (39733793).

The spelling of 27321421 in words is "twenty-seven million, three hundred twenty-one thousand, four hundred twenty-one".