27158021 has 8 divisors (see below), whose sum is σ = 29769888. Its totient is φ = 24570000.

The previous prime is 27157987. The next prime is 27158029. The reversal of 27158021 is 12085172.

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 27158021 - 2¹⁴ = 27141637 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 (27158029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3530 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (3721236).

Almost surely, 2^27158021 is an apocalyptic number.

It is an amenable number.

27158021 is a deficient number, since it is larger than the sum of its proper divisors (2611867).

27158021 is a wasteful number, since it uses less digits than its factorization.

27158021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11923.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 27158021 is about 5211.3358172353. The cubic root of 27158021 is about 300.5841248852.

The spelling of 27158021 in words is "twenty-seven million, one hundred fifty-eight thousand, twenty-one".