21203131300 has 72 divisors (see below), whose sum is σ = 49658516096. Its totient is φ = 7811717760.

The previous prime is 21203131283. The next prime is 21203131303. The reversal of 21203131300 is 313130212.

It is not an unprimeable number, because it can be changed into a prime (21203131303) 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, 584287 + ... + 619513.

Almost surely, 2^21203131300 is an apocalyptic number.

21203131300 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 21203131300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24829258048).

21203131300 is an abundant number, since it is smaller than the sum of its proper divisors (28455384796).

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

21203131300 is a wasteful number, since it uses less digits than its factorization.

21203131300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35717 (or 35710 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21203131300 its reverse (313130212), we get a palindrome (21516261512).

The spelling of 21203131300 in words is "twenty-one billion, two hundred three million, one hundred thirty-one thousand, three hundred".