21444499200 has 216 divisors, whose sum is σ = 71772656256. Its totient is φ = 5637632000.

The previous prime is 21444499157. The next prime is 21444499231. The reversal of 21444499200 is 299444412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1355335 + ... + 1371065.

It is an arithmetic number, because the mean of its divisors is an integer number (332280816).

Almost surely, 2^21444499200 is an apocalyptic number.

21444499200 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 21444499200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35886328128).

21444499200 is an abundant number, since it is smaller than the sum of its proper divisors (50328157056).

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

21444499200 is a wasteful number, since it uses less digits than its factorization.

21444499200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15831 (or 15812 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 21444499200 in words is "twenty-one billion, four hundred forty-four million, four hundred ninety-nine thousand, two hundred".