27120021 has 4 divisors (see below), whose sum is σ = 36160032. Its totient is φ = 18080012.

The previous prime is 27120019. The next prime is 27120043. The reversal of 27120021 is 12002172.

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 27120021 - 2¹ = 27120019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27120421) 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, 4520001 + ... + 4520006.

It is an arithmetic number, because the mean of its divisors is an integer number (9040008).

Almost surely, 2^27120021 is an apocalyptic number.

It is an amenable number.

27120021 is a deficient number, since it is larger than the sum of its proper divisors (9040011).

27120021 is an equidigital number, since it uses as much as digits as its factorization.

27120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9040010.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 27120021 is about 5207.6886427666. The cubic root of 27120021 is about 300.4438651774.

Adding to 27120021 its reverse (12002172), we get a palindrome (39122193).

The spelling of 27120021 in words is "twenty-seven million, one hundred twenty thousand, twenty-one".