27250021 has 2 divisors, whose sum is σ = 27250022. Its totient is φ = 27250020.

The previous prime is 27250007. The next prime is 27250033. The reversal of 27250021 is 12005272.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25250625 + 1999396 = 5025^2 + 1414^2 .

It is a cyclic number.

It is not a de Polignac number, because 27250021 - 2¹³ = 27241829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27250001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13625010 + 13625011.

It is an arithmetic number, because the mean of its divisors is an integer number (13625011).

Almost surely, 2^27250021 is an apocalyptic number.

It is an amenable number.

27250021 is a deficient number, since it is larger than the sum of its proper divisors (1).

27250021 is an equidigital number, since it uses as much as digits as its factorization.

27250021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 27250021 is about 5220.1552658901. The cubic root of 27250021 is about 300.9231600416.

Adding to 27250021 its reverse (12005272), we get a palindrome (39255293).

The spelling of 27250021 in words is "twenty-seven million, two hundred fifty thousand, twenty-one".