27027021 has 32 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 14930496.

The previous prime is 27027019. The next prime is 27027053. The reversal of 27027021 is 12072072.

It is not a de Polignac number, because 27027021 - 2¹ = 27027019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27027061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137095 + ... + 137291.

It is an arithmetic number, because the mean of its divisors is an integer number (1330560).

Almost surely, 2^27027021 is an apocalyptic number.

27027021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27027021 is a deficient number, since it is larger than the sum of its proper divisors (15550899).

27027021 is a wasteful number, since it uses less digits than its factorization.

27027021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 27027021 is about 5198.7518694394. The cubic root of 27027021 is about 300.1000444111.

Adding to 27027021 its reverse (12072072), we get a palindrome (39099093).

The spelling of 27027021 in words is "twenty-seven million, twenty-seven thousand, twenty-one".