21200130 has 80 divisors (see below), whose sum is σ = 65165760. Its totient is φ = 4844448.

The previous prime is 21200129. The next prime is 21200147. The reversal of 21200130 is 3100212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3801 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (814572).

Almost surely, 2^21200130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32582880).

21200130 is an abundant number, since it is smaller than the sum of its proper divisors (43965630).

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

21200130 is a wasteful number, since it uses less digits than its factorization.

21200130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765 (or 3756 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 21200130 is about 4604.3598903648. The cubic root of 21200130 is about 276.7660664434.

Adding to 21200130 its reverse (3100212), we get a palindrome (24300342).

The spelling of 21200130 in words is "twenty-one million, two hundred thousand, one hundred thirty".