21593194200 has 144 divisors (see below), whose sum is σ = 72794470320. Its totient is φ = 5736165120.

The previous prime is 21593194199. The next prime is 21593194223. The reversal of 21593194200 is 249139512.

21593194200 is a `hidden beast` number, since 21 + 593 + 1 + 9 + 42 + 0 + 0 = 666.

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

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 35 ways as a sum of consecutive naturals, for example, 450594 + ... + 496206.

It is an arithmetic number, because the mean of its divisors is an integer number (505517155).

Almost surely, 2^21593194200 is an apocalyptic number.

21593194200 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 21593194200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36397235160).

21593194200 is an abundant number, since it is smaller than the sum of its proper divisors (51201276120).

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

21593194200 is a wasteful number, since it uses less digits than its factorization.

21593194200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45898 (or 45886 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The spelling of 21593194200 in words is "twenty-one billion, five hundred ninety-three million, one hundred ninety-four thousand, two hundred".