21003200 has 42 divisors (see below), whose sum is σ = 51684936. Its totient is φ = 8400640.

The previous prime is 21003179. The next prime is 21003223. The reversal of 21003200 is 230012.

It is a super-2 number, since 2×21003200² = 882268820480000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

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, 4964 + ... + 8163.

Almost surely, 2^21003200 is an apocalyptic number.

21003200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21003200 is an abundant number, since it is smaller than the sum of its proper divisors (30681736).

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

21003200 is a wasteful number, since it uses less digits than its factorization.

21003200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149 (or 13134 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 21003200 is about 4582.9248302803. The cubic root of 21003200 is about 275.9064305095.

Adding to 21003200 its reverse (230012), we get a palindrome (21233212).

The spelling of 21003200 in words is "twenty-one million, three thousand, two hundred".