21200163 has 4 divisors (see below), whose sum is σ = 28266888. Its totient is φ = 14133440.

The previous prime is 21200147. The next prime is 21200171. The reversal of 21200163 is 36100212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200163 - 2⁴ = 21200147 is a prime.

It is a super-3 number, since 3×21200163³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21200563) 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 3 ways as a sum of consecutive naturals, for example, 3533358 + ... + 3533363.

It is an arithmetic number, because the mean of its divisors is an integer number (7066722).

Almost surely, 2^21200163 is an apocalyptic number.

21200163 is a deficient number, since it is larger than the sum of its proper divisors (7066725).

21200163 is an equidigital number, since it uses as much as digits as its factorization.

21200163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066724.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 21200163 is about 4604.3634739234. The cubic root of 21200163 is about 276.7662100475.

Adding to 21200163 its reverse (36100212), we get a palindrome (57300375).

The spelling of 21200163 in words is "twenty-one million, two hundred thousand, one hundred sixty-three".