21338163 has 48 divisors (see below), whose sum is σ = 39416832. Its totient is φ = 10800000.

The previous prime is 21338153. The next prime is 21338183. The reversal of 21338163 is 36183312.

It is a happy number.

It is not a de Polignac number, because 21338163 - 2⁵ = 21338131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21338143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28038 + ... + 28788.

It is an arithmetic number, because the mean of its divisors is an integer number (821184).

Almost surely, 2^21338163 is an apocalyptic number.

21338163 is a deficient number, since it is larger than the sum of its proper divisors (18078669).

21338163 is a wasteful number, since it uses less digits than its factorization.

21338163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816 (or 813 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21338163 is about 4619.3249506827. The cubic root of 21338163 is about 277.3654375600.

It can be divided in two parts, 213381 and 63, that added together give a square (213444 = 462²).

The spelling of 21338163 in words is "twenty-one million, three hundred thirty-eight thousand, one hundred sixty-three".