21243057300 has 144 divisors (see below), whose sum is σ = 68969544000. Its totient is φ = 5608656000.

The previous prime is 21243057263. The next prime is 21243057313. The reversal of 21243057300 is 375034212.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 47 ways as a sum of consecutive naturals, for example, 233751 + ... + 311649.

Almost surely, 2^21243057300 is an apocalyptic number.

21243057300 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 21243057300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34484772000).

21243057300 is an abundant number, since it is smaller than the sum of its proper divisors (47726486700).

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

21243057300 is a wasteful number, since it uses less digits than its factorization.

21243057300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78023 (or 78010 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The spelling of 21243057300 in words is "twenty-one billion, two hundred forty-three million, fifty-seven thousand, three hundred".