21113200 has 30 divisors (see below), whose sum is σ = 50725424. Its totient is φ = 8445120.

The previous prime is 21113173. The next prime is 21113221. The reversal of 21113200 is 231112.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25992 + ... + 26791.

Almost surely, 2^21113200 is an apocalyptic number.

21113200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113200 is an abundant number, since it is smaller than the sum of its proper divisors (29612224).

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

21113200 is a wasteful number, since it uses less digits than its factorization.

21113200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52801 (or 52790 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 21113200 is about 4594.9102276323. The cubic root of 21113200 is about 276.3872600577.

Adding to 21113200 its reverse (231112), we get a palindrome (21344312).

The spelling of 21113200 in words is "twenty-one million, one hundred thirteen thousand, two hundred".