21136200 has 48 divisors (see below), whose sum is σ = 65524080. Its totient is φ = 5636160.

The previous prime is 21136187. The next prime is 21136207. The reversal of 21136200 is 263112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21136200.

It is not an unprimeable number, because it can be changed into a prime (21136207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17014 + ... + 18213.

It is an arithmetic number, because the mean of its divisors is an integer number (1365085).

Almost surely, 2^21136200 is an apocalyptic number.

21136200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21136200 is an abundant number, since it is smaller than the sum of its proper divisors (44387880).

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

21136200 is a wasteful number, since it uses less digits than its factorization.

21136200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35246 (or 35237 counting only the distinct ones).

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

The square root of 21136200 is about 4597.4123156402. The cubic root of 21136200 is about 276.4875859209.

Adding to 21136200 its reverse (263112), we get a palindrome (21399312).

The spelling of 21136200 in words is "twenty-one million, one hundred thirty-six thousand, two hundred".