21227200 has 42 divisors (see below), whose sum is σ = 52236116. Its totient is φ = 8490240.

The previous prime is 21227177. The next prime is 21227201. The reversal of 21227200 is 272212.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21227201) 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 5 ways as a sum of consecutive naturals, for example, 5034 + ... + 8233.

Almost surely, 2^21227200 is an apocalyptic number.

21227200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21227200 is an abundant number, since it is smaller than the sum of its proper divisors (31008916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21227200 is a wasteful number, since it uses less digits than its factorization.

21227200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13289 (or 13274 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 21227200 is about 4607.2985577234. The cubic root of 21227200 is about 276.8838152632.

Adding to 21227200 its reverse (272212), we get a palindrome (21499412).

The spelling of 21227200 in words is "twenty-one million, two hundred twenty-seven thousand, two hundred".