21939838200 has 1008 divisors, whose sum is σ = 92472128280. Its totient is φ = 4820497920.

The previous prime is 21939838181. The next prime is 21939838231. The reversal of 21939838200 is 283893912.

21939838200 is a `hidden beast` number, since 21 + 9 + 398 + 38 + 200 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 264335359 + ... + 264335441.

Almost surely, 2^21939838200 is an apocalyptic number.

21939838200 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 21939838200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46236064140).

21939838200 is an abundant number, since it is smaller than the sum of its proper divisors (70532290080).

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

21939838200 is a wasteful number, since it uses less digits than its factorization.

21939838200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 21939838200 in words is "twenty-one billion, nine hundred thirty-nine million, eight hundred thirty-eight thousand, two hundred".