27208021 has 2 divisors, whose sum is σ = 27208022. Its totient is φ = 27208020.

The previous prime is 27208009. The next prime is 27208039. The reversal of 27208021 is 12080272.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18879025 + 8328996 = 4345^2 + 2886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27208021 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 27207983 and 27208001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27200021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13604010 + 13604011.

It is an arithmetic number, because the mean of its divisors is an integer number (13604011).

Almost surely, 2^27208021 is an apocalyptic number.

It is an amenable number.

27208021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27208021 is an equidigital number, since it uses as much as digits as its factorization.

27208021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 27208021 is about 5216.1308457515. The cubic root of 27208021 is about 300.7684779395.

Adding to 27208021 its reverse (12080272), we get a palindrome (39288293).

The spelling of 27208021 in words is "twenty-seven million, two hundred eight thousand, twenty-one".