21230200 has 48 divisors (see below), whose sum is σ = 49896360. Its totient is φ = 8400000.

The previous prime is 21230179. The next prime is 21230203. The reversal of 21230200 is 203212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230203) 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 11 ways as a sum of consecutive naturals, for example, 19675 + ... + 20725.

Almost surely, 2^21230200 is an apocalyptic number.

21230200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21230200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24948180).

21230200 is an abundant number, since it is smaller than the sum of its proper divisors (28666160).

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

21230200 is a wasteful number, since it uses less digits than its factorization.

21230200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1168 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21230200 is about 4607.6241166137. The cubic root of 21230200 is about 276.8968584706.

Adding to 21230200 its reverse (203212), we get a palindrome (21433412).

The spelling of 21230200 in words is "twenty-one million, two hundred thirty thousand, two hundred".