21200313320 has 64 divisors (see below), whose sum is σ = 48637400400. Its totient is φ = 8314490880.

The previous prime is 21200313313. The next prime is 21200313331. The reversal of 21200313320 is 2331300212.

It can be written as a sum of positive squares in 8 ways, for example, as 506340004 + 20693973316 = 22502^2 + 143854^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 759776 + ... + 787184.

Almost surely, 2^21200313320 is an apocalyptic number.

21200313320 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 21200313320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24318700200).

21200313320 is an abundant number, since it is smaller than the sum of its proper divisors (27437087080).

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

21200313320 is a wasteful number, since it uses less digits than its factorization.

21200313320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27798 (or 27794 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21200313320 its reverse (2331300212), we get a palindrome (23531613532).

The spelling of 21200313320 in words is "twenty-one billion, two hundred million, three hundred thirteen thousand, three hundred twenty".