21600200655 has 72 divisors (see below), whose sum is σ = 41200548480. Its totient is φ = 10460841600.

The previous prime is 21600200651. The next prime is 21600200689. The reversal of 21600200655 is 55600200612.

21600200655 is a `hidden beast` number, since 2 + 1 + 6 + 0 + 0 + 2 + 0 + 0 + 655 = 666.

It is not a de Polignac number, because 21600200655 - 2² = 21600200651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21600200651) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6428866 + ... + 6432224.

It is an arithmetic number, because the mean of its divisors is an integer number (572229840).

Almost surely, 2^21600200655 is an apocalyptic number.

21600200655 is a deficient number, since it is larger than the sum of its proper divisors (19600347825).

21600200655 is a wasteful number, since it uses less digits than its factorization.

21600200655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4573 (or 4559 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The spelling of 21600200655 in words is "twenty-one billion, six hundred million, two hundred thousand, six hundred fifty-five".