21165027 has 8 divisors (see below), whose sum is σ = 30390864. Its totient is φ = 13024608.

The previous prime is 21165019. The next prime is 21165047. The reversal of 21165027 is 72056112.

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

It is not a de Polignac number, because 21165027 - 2³ = 21165019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21164988 and 21165006.

It is not an unprimeable number, because it can be changed into a prime (21165007) 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, 271308 + ... + 271385.

It is an arithmetic number, because the mean of its divisors is an integer number (3798858).

Almost surely, 2^21165027 is an apocalyptic number.

21165027 is a deficient number, since it is larger than the sum of its proper divisors (9225837).

21165027 is a wasteful number, since it uses less digits than its factorization.

21165027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542709.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 21165027 is about 4600.5463805944. The cubic root of 21165027 is about 276.6132264003.

The spelling of 21165027 in words is "twenty-one million, one hundred sixty-five thousand, twenty-seven".