21053200 has 120 divisors (see below), whose sum is σ = 59166848. Its totient is φ = 7050240.

The previous prime is 21053173. The next prime is 21053203. The reversal of 21053200 is 235012.

It is not an unprimeable number, because it can be changed into a prime (21053203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 204349 + ... + 204451.

Almost surely, 2^21053200 is an apocalyptic number.

21053200 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 21053200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29583424).

21053200 is an abundant number, since it is smaller than the sum of its proper divisors (38113648).

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

21053200 is a wasteful number, since it uses less digits than its factorization.

21053200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 21053200 is about 4588.3766192413. The cubic root of 21053200 is about 276.1251969987.

Adding to 21053200 its reverse (235012), we get a palindrome (21288212).

The spelling of 21053200 in words is "twenty-one million, fifty-three thousand, two hundred".