21198843600 has 360 divisors, whose sum is σ = 78708483168. Its totient is φ = 4835942400.

The previous prime is 21198843587. The next prime is 21198843637. The reversal of 21198843600 is 634889112.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 3812022 + ... + 3817578.

Almost surely, 2^21198843600 is an apocalyptic number.

21198843600 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 21198843600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39354241584).

21198843600 is an abundant number, since it is smaller than the sum of its proper divisors (57509639568).

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

21198843600 is a wasteful number, since it uses less digits than its factorization.

21198843600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5623 (or 5595 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21198843600 in words is "twenty-one billion, one hundred ninety-eight million, eight hundred forty-three thousand, six hundred".