21043013200 has 180 divisors, whose sum is σ = 56867582464. Its totient is φ = 7473312000.

The previous prime is 21043013183. The next prime is 21043013213. The reversal of 21043013200 is 231034012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2076145 + ... + 2086255.

Almost surely, 2^21043013200 is an apocalyptic number.

21043013200 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 21043013200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28433791232).

21043013200 is an abundant number, since it is smaller than the sum of its proper divisors (35824569264).

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

21043013200 is a wasteful number, since it uses less digits than its factorization.

21043013200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10194 (or 10172 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21043013200 its reverse (231034012), we get a palindrome (21274047212).

The spelling of 21043013200 in words is "twenty-one billion, forty-three million, thirteen thousand, two hundred".