21056666200 has 48 divisors (see below), whose sum is σ = 49687478280. Its totient is φ = 8296949760.

The previous prime is 21056666179. The next prime is 21056666233. The reversal of 21056666200 is 266665012.

It is a congruent number.

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, 772297 + ... + 799096.

Almost surely, 2^21056666200 is an apocalyptic number.

21056666200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21056666200 is an abundant number, since it is smaller than the sum of its proper divisors (28630812080).

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

21056666200 is a wasteful number, since it uses less digits than its factorization.

21056666200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571476 (or 1571467 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21056666200 in words is "twenty-one billion, fifty-six million, six hundred sixty-six thousand, two hundred".