21166327 has 8 divisors (see below), whose sum is σ = 26050976. Its totient is φ = 16746912.

The previous prime is 21166319. The next prime is 21166337. The reversal of 21166327 is 72366112.

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

It is not a de Polignac number, because 21166327 - 2³ = 21166319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21166295 and 21166304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166337) 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, 116208 + ... + 116389.

It is an arithmetic number, because the mean of its divisors is an integer number (3256372).

Almost surely, 2^21166327 is an apocalyptic number.

21166327 is a deficient number, since it is larger than the sum of its proper divisors (4884649).

21166327 is a wasteful number, since it uses less digits than its factorization.

21166327 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232617.

The product of its digits is 3024, while the sum is 28.

The square root of 21166327 is about 4600.6876659908. The cubic root of 21166327 is about 276.6188896710.

The spelling of 21166327 in words is "twenty-one million, one hundred sixty-six thousand, three hundred twenty-seven".