21052200 has 96 divisors (see below), whose sum is σ = 70308000. Its totient is φ = 5180160.

The previous prime is 21052177. The next prime is 21052217. The reversal of 21052200 is 225012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6451 + ... + 9149.

It is an arithmetic number, because the mean of its divisors is an integer number (732375).

Almost surely, 2^21052200 is an apocalyptic number.

21052200 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 21052200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35154000).

21052200 is an abundant number, since it is smaller than the sum of its proper divisors (49255800).

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

21052200 is a wasteful number, since it uses less digits than its factorization.

21052200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2731 (or 2722 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 21052200 is about 4588.2676469448. The cubic root of 21052200 is about 276.1208250653.

Adding to 21052200 its reverse (225012), we get a palindrome (21277212).

The spelling of 21052200 in words is "twenty-one million, fifty-two thousand, two hundred".