21123130300 has 144 divisors (see below), whose sum is σ = 51026734080. Its totient is φ = 7556544000.

The previous prime is 21123130291. The next prime is 21123130339. The reversal of 21123130300 is 303132112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2410527 + ... + 2419273.

It is an arithmetic number, because the mean of its divisors is an integer number (354352320).

Almost surely, 2^21123130300 is an apocalyptic number.

21123130300 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 21123130300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25513367040).

21123130300 is an abundant number, since it is smaller than the sum of its proper divisors (29903603780).

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

21123130300 is a wasteful number, since it uses less digits than its factorization.

21123130300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8852 (or 8845 counting only the distinct ones).

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

Adding to 21123130300 its reverse (303132112), we get a palindrome (21426262412).

The spelling of 21123130300 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty thousand, three hundred".