20130021200 has 120 divisors (see below), whose sum is σ = 51771760800. Its totient is φ = 7498759680.

The previous prime is 20130021187. The next prime is 20130021217. The reversal of 20130021200 is 212003102.

It is a happy number.

It is a congruent number.

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, 425954 + ... + 470846.

It is an arithmetic number, because the mean of its divisors is an integer number (431431340).

Almost surely, 2^20130021200 is an apocalyptic number.

20130021200 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 20130021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25885880400).

20130021200 is an abundant number, since it is smaller than the sum of its proper divisors (31641739600).

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

20130021200 is a wasteful number, since it uses less digits than its factorization.

20130021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44989 (or 44978 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20130021200 its reverse (212003102), we get a palindrome (20342024302).

The spelling of 20130021200 in words is "twenty billion, one hundred thirty million, twenty-one thousand, two hundred".