27000021 has 8 divisors (see below), whose sum is σ = 36131104. Its totient is φ = 17934480.

The previous prime is 27000013. The next prime is 27000023. The reversal of 27000021 is 12000072.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27000021 - 2³ = 27000013 is a prime.

It is a super-2 number, since 2×27000021² = 1458002268000882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26999970 and 27000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15415 + ... + 17076.

It is an arithmetic number, because the mean of its divisors is an integer number (4516388).

Almost surely, 2^27000021 is an apocalyptic number.

It is an amenable number.

27000021 is a deficient number, since it is larger than the sum of its proper divisors (9131083).

27000021 is a wasteful number, since it uses less digits than its factorization.

27000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32771.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 27000021 is about 5196.1544434322. The cubic root of 27000021 is about 300.0000777778. Note that the first 4 decimals are identical.

Adding to 27000021 its reverse (12000072), we get a palindrome (39000093).

The spelling of 27000021 in words is "twenty-seven million, twenty-one", and thus it is an aban number and an uban number.