27290021 has 4 divisors (see below), whose sum is σ = 29770944. Its totient is φ = 24809100.

The previous prime is 27290017. The next prime is 27290027. The reversal of 27290021 is 12009272.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27290021 - 2² = 27290017 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 (27290027) 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 in 3 ways as a sum of consecutive naturals, for example, 1240445 + ... + 1240466.

It is an arithmetic number, because the mean of its divisors is an integer number (7442736).

Almost surely, 2^27290021 is an apocalyptic number.

It is an amenable number.

27290021 is a deficient number, since it is larger than the sum of its proper divisors (2480923).

27290021 is a wasteful number, since it uses less digits than its factorization.

27290021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480922.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 27290021 is about 5223.9851646037. The cubic root of 27290021 is about 301.0703286325.

Adding to 27290021 its reverse (12009272), we get a palindrome (39299293).

The spelling of 27290021 in words is "twenty-seven million, two hundred ninety thousand, twenty-one".