21250663200 has 288 divisors, whose sum is σ = 82769702400. Its totient is φ = 5230863360.

The previous prime is 21250663163. The next prime is 21250663207. The reversal of 21250663200 is 236605212.

21250663200 is a `hidden beast` number, since 2 + 1 + 25 + 0 + 6 + 632 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

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

It is not an unprimeable number, because it can be changed into a prime (21250663207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 242961 + ... + 318639.

It is an arithmetic number, because the mean of its divisors is an integer number (287394800).

Almost surely, 2^21250663200 is an apocalyptic number.

21250663200 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 21250663200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41384851200).

21250663200 is an abundant number, since it is smaller than the sum of its proper divisors (61519039200).

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

21250663200 is a wasteful number, since it uses less digits than its factorization.

21250663200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75721 (or 75702 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The spelling of 21250663200 in words is "twenty-one billion, two hundred fifty million, six hundred sixty-three thousand, two hundred".