21311112300 has 144 divisors (see below), whose sum is σ = 65065835520. Its totient is φ = 5374645760.

The previous prime is 21311112299. The next prime is 21311112341. The reversal of 21311112300 is 321111312.

It is a happy number.

It is a super-2 number, since 2×21311112300² (a number of 21 digits) contains 22 as substring.

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 21311112300.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 596749 + ... + 631451.

It is an arithmetic number, because the mean of its divisors is an integer number (451846080).

Almost surely, 2^21311112300 is an apocalyptic number.

21311112300 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 21311112300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32532917760).

21311112300 is an abundant number, since it is smaller than the sum of its proper divisors (43754723220).

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

21311112300 is a wasteful number, since it uses less digits than its factorization.

21311112300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34832 (or 34825 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21311112300 its reverse (321111312), we get a palindrome (21632223612).

The spelling of 21311112300 in words is "twenty-one billion, three hundred eleven million, one hundred twelve thousand, three hundred".