21200223 has 32 divisors (see below), whose sum is σ = 32175360. Its totient is φ = 12303360.

The previous prime is 21200209. The next prime is 21200233. The reversal of 21200223 is 32200212.

It is not a de Polignac number, because 21200223 - 2⁵ = 21200191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21200199 and 21200208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118348 + ... + 118526.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^21200223 is an apocalyptic number.

21200223 is a deficient number, since it is larger than the sum of its proper divisors (10975137).

21200223 is a wasteful number, since it uses less digits than its factorization.

21200223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21200223 is about 4604.3699894774. The cubic root of 21200223 is about 276.7664711454.

Adding to 21200223 its reverse (32200212), we get a palindrome (53400435).

The spelling of 21200223 in words is "twenty-one million, two hundred thousand, two hundred twenty-three".