27391021 has 8 divisors (see below), whose sum is σ = 31337600. Its totient is φ = 23452848.

The previous prime is 27391003. The next prime is 27391031. The reversal of 27391021 is 12019372.

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

It is a cyclic number.

It is not a de Polignac number, because 27391021 - 2¹³ = 27382829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27391031) 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 7 ways as a sum of consecutive naturals, for example, 8395 + ... + 11191.

It is an arithmetic number, because the mean of its divisors is an integer number (3917200).

Almost surely, 2^27391021 is an apocalyptic number.

It is an amenable number.

27391021 is a deficient number, since it is larger than the sum of its proper divisors (3946579).

27391021 is a wasteful number, since it uses less digits than its factorization.

27391021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4203.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 27391021 is about 5233.6431861563. The cubic root of 27391021 is about 301.4412904432.

The spelling of 27391021 in words is "twenty-seven million, three hundred ninety-one thousand, twenty-one".