21194327200 has 72 divisors (see below), whose sum is σ = 51897615840. Its totient is φ = 8452012800.

The previous prime is 21194327191. The next prime is 21194327237. The reversal of 21194327200 is 272349112.

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 11 ways as a sum of consecutive naturals, for example, 224781 + ... + 304819.

It is an arithmetic number, because the mean of its divisors is an integer number (720800220).

Almost surely, 2^21194327200 is an apocalyptic number.

21194327200 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 21194327200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25948807920).

21194327200 is an abundant number, since it is smaller than the sum of its proper divisors (30703288640).

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

21194327200 is a wasteful number, since it uses less digits than its factorization.

21194327200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80390 (or 80377 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 21194327200 in words is "twenty-one billion, one hundred ninety-four million, three hundred twenty-seven thousand, two hundred".