21000303065200 has 120 divisors (see below), whose sum is σ = 50565236832000. Its totient is φ = 8381481108480.

The previous prime is 21000303065191. The next prime is 21000303065201. The reversal of 21000303065200 is 256030300012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000303065201) 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, 977065654 + ... + 977087146.

It is an arithmetic number, because the mean of its divisors is an integer number (421376973600).

Almost surely, 2^{21000303065200} is an apocalyptic number.

21000303065200 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 21000303065200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25282618416000).

21000303065200 is an abundant number, since it is smaller than the sum of its proper divisors (29564933766800).

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

21000303065200 is a wasteful number, since it uses less digits than its factorization.

21000303065200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26819 (or 26808 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

Adding to 21000303065200 its reverse (256030300012), we get a palindrome (21256333365212).

The spelling of 21000303065200 in words is "twenty-one trillion, three hundred three million, sixty-five thousand, two hundred".