21320310300 has 108 divisors (see below), whose sum is σ = 65529113160. Its totient is φ = 5350958080.

The previous prime is 21320310289. The next prime is 21320310301. The reversal of 21320310300 is 301302312.

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 21320310300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320310301) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 36255 + ... + 209654.

Almost surely, 2^21320310300 is an apocalyptic number.

21320310300 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 21320310300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32764556580).

21320310300 is an abundant number, since it is smaller than the sum of its proper divisors (44208802860).

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

21320310300 is a wasteful number, since it uses less digits than its factorization.

21320310300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245960 (or 245936 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21320310300 its reverse (301302312), we get a palindrome (21621612612).

The spelling of 21320310300 in words is "twenty-one billion, three hundred twenty million, three hundred ten thousand, three hundred".