21203200000 has 144 divisors (see below), whose sum is σ = 53007661980. Its totient is φ = 8478720000.

The previous prime is 21203199977. The next prime is 21203200001. The reversal of 21203200000 is 230212.

It can be written as a sum of positive squares in 6 ways, for example, as 217621504 + 20985578496 = 14752^2 + 144864^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 21203200000.

It is not an unprimeable number, because it can be changed into a prime (21203200001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6398344 + ... + 6401656.

Almost surely, 2^21203200000 is an apocalyptic number.

21203200000 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 21203200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26503830990).

21203200000 is an abundant number, since it is smaller than the sum of its proper divisors (31804461980).

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

21203200000 is an frugal number, since it uses more digits than its factorization.

21203200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360 (or 3320 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

Adding to 21203200000 its reverse (230212), we get a palindrome (21203430212).

The spelling of 21203200000 in words is "twenty-one billion, two hundred three million, two hundred thousand".