21450679200 has 252 divisors, whose sum is σ = 78515923878. Its totient is φ = 5720025600.

The previous prime is 21450679189. The next prime is 21450679303. The reversal of 21450679200 is 297605412.

It can be written as a sum of positive squares in 3 ways, for example, as 8566613136 + 12884066064 = 92556^2 + 113508^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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 41 ways as a sum of consecutive naturals, for example, 564810 + ... + 601590.

Almost surely, 2^21450679200 is an apocalyptic number.

21450679200 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 21450679200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39257961939).

21450679200 is an abundant number, since it is smaller than the sum of its proper divisors (57065244678).

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

21450679200 is an equidigital number, since it uses as much as digits as its factorization.

21450679200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36819 (or 36791 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21450679200 in words is "twenty-one billion, four hundred fifty million, six hundred seventy-nine thousand, two hundred".