21233121300 has 216 divisors, whose sum is σ = 72653162400. Its totient is φ = 5364040320.

The previous prime is 21233121289. The next prime is 21233121361. The reversal of 21233121300 is 312133212.

21233121300 is a `hidden beast` number, since 2 + 12 + 331 + 21 + 300 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 438706 + ... + 484694.

Almost surely, 2^21233121300 is an apocalyptic number.

21233121300 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 21233121300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36326581200).

21233121300 is an abundant number, since it is smaller than the sum of its proper divisors (51420041100).

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

21233121300 is a wasteful number, since it uses less digits than its factorization.

21233121300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46037 (or 46018 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21233121300 its reverse (312133212), we get a palindrome (21545254512).

The spelling of 21233121300 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-one thousand, three hundred".