27245021 has 4 divisors (see below), whose sum is σ = 27759132. Its totient is φ = 26730912.

The previous prime is 27245017. The next prime is 27245077. The reversal of 27245021 is 12054272.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14364100 + 12880921 = 3790^2 + 3589^2 .

It is a cyclic number.

It is not a de Polignac number, because 27245021 - 2² = 27245017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27245011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256976 + ... + 257081.

It is an arithmetic number, because the mean of its divisors is an integer number (6939783).

Almost surely, 2^27245021 is an apocalyptic number.

It is an amenable number.

27245021 is a deficient number, since it is larger than the sum of its proper divisors (514111).

27245021 is an equidigital number, since it uses as much as digits as its factorization.

27245021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514110.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 27245021 is about 5219.6763309615. The cubic root of 27245021 is about 300.9047538438.

Adding to 27245021 its reverse (12054272), we get a palindrome (39299293).

The spelling of 27245021 in words is "twenty-seven million, two hundred forty-five thousand, twenty-one".