27213421 has 2 divisors, whose sum is σ = 27213422. Its totient is φ = 27213420.

The previous prime is 27213409. The next prime is 27213437. The reversal of 27213421 is 12431272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17757796 + 9455625 = 4214^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 27213421 - 2¹³ = 27205229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27213392 and 27213401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27213721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13606710 + 13606711.

It is an arithmetic number, because the mean of its divisors is an integer number (13606711).

Almost surely, 2^27213421 is an apocalyptic number.

It is an amenable number.

27213421 is a deficient number, since it is larger than the sum of its proper divisors (1).

27213421 is an equidigital number, since it uses as much as digits as its factorization.

27213421 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 27213421 is about 5216.6484451226. The cubic root of 27213421 is about 300.7883745519.

Adding to 27213421 its reverse (12431272), we get a palindrome (39644693).

The spelling of 27213421 in words is "twenty-seven million, two hundred thirteen thousand, four hundred twenty-one".