21855738200 has 24 divisors (see below), whose sum is σ = 50814591780. Its totient is φ = 8742295200.

The previous prime is 21855738197. The next prime is 21855738217. The reversal of 21855738200 is 283755812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54639146 + ... + 54639545.

Almost surely, 2^21855738200 is an apocalyptic number.

21855738200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21855738200 is an abundant number, since it is smaller than the sum of its proper divisors (28958853580).

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

21855738200 is a wasteful number, since it uses less digits than its factorization.

21855738200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109278707 (or 109278698 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The spelling of 21855738200 in words is "twenty-one billion, eight hundred fifty-five million, seven hundred thirty-eight thousand, two hundred".