21600200656 has 10 divisors (see below), whose sum is σ = 41850388802. Its totient is φ = 10800100320.

The previous prime is 21600200651. The next prime is 21600200689. The reversal of 21600200656 is 65600200612.

It can be written as a sum of positive squares in only one way, i.e., 12206714256 + 9393486400 = 110484^2 + 96920^2 .

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 as a sum of consecutive naturals, namely, 675006255 + ... + 675006286.

Almost surely, 2^21600200656 is an apocalyptic number.

It is an amenable number.

21600200656 is a deficient number, since it is larger than the sum of its proper divisors (20250188146).

21600200656 is a wasteful number, since it uses less digits than its factorization.

21600200656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350012549 (or 1350012543 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The spelling of 21600200656 in words is "twenty-one billion, six hundred million, two hundred thousand, six hundred fifty-six".