21200302320 has 160 divisors (see below), whose sum is σ = 68016599040. Its totient is φ = 5456885760.

The previous prime is 21200302309. The next prime is 21200302327. The reversal of 21200302320 is 2320300212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21200302320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200302327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3039477 + ... + 3046443.

It is an arithmetic number, because the mean of its divisors is an integer number (425103744).

Almost surely, 2^21200302320 is an apocalyptic number.

21200302320 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 21200302320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34008299520).

21200302320 is an abundant number, since it is smaller than the sum of its proper divisors (46816296720).

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

21200302320 is a wasteful number, since it uses less digits than its factorization.

21200302320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7423 (or 7417 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21200302320 its reverse (2320300212), we get a palindrome (23520602532).

The spelling of 21200302320 in words is "twenty-one billion, two hundred million, three hundred two thousand, three hundred twenty".