21838163 has 8 divisors (see below), whose sum is σ = 23212800. Its totient is φ = 20486088.

The previous prime is 21838153. The next prime is 21838171. The reversal of 21838163 is 36183812.

It is a happy number.

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 21838163 - 2⁶ = 21838099 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21838123) 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, 3623 + ... + 7536.

It is an arithmetic number, because the mean of its divisors is an integer number (2901600).

Almost surely, 2^21838163 is an apocalyptic number.

21838163 is a deficient number, since it is larger than the sum of its proper divisors (1374637).

21838163 is a wasteful number, since it uses less digits than its factorization.

21838163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11281.

The product of its digits is 6912, while the sum is 32.

The square root of 21838163 is about 4673.1320332300. The cubic root of 21838163 is about 279.5151600995.

The spelling of 21838163 in words is "twenty-one million, eight hundred thirty-eight thousand, one hundred sixty-three".