21002131220200 has 144 divisors (see below), whose sum is σ = 53151889132800. Its totient is φ = 7714030521600.

The previous prime is 21002131220167. The next prime is 21002131220309. The reversal of 21002131220200 is 202213120012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4829191 + ... + 8082409.

It is an arithmetic number, because the mean of its divisors is an integer number (369110341200).

Almost surely, 2^{21002131220200} is an apocalyptic number.

21002131220200 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 21002131220200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26575944566400).

21002131220200 is an abundant number, since it is smaller than the sum of its proper divisors (32149757912600).

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

21002131220200 is a wasteful number, since it uses less digits than its factorization.

21002131220200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253452 (or 3253430 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002131220200 its reverse (202213120012), we get a palindrome (21204344340212).

The spelling of 21002131220200 in words is "twenty-one trillion, two billion, one hundred thirty-one million, two hundred twenty thousand, two hundred".