21600200666 has 8 divisors (see below), whose sum is σ = 35345782944. Its totient is φ = 9818273020.

The previous prime is 21600200651. The next prime is 21600200689. The reversal of 21600200666 is 66600200612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21600200666² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490913630 + ... + 490913673.

It is an arithmetic number, because the mean of its divisors is an integer number (4418222868).

Almost surely, 2^21600200666 is an apocalyptic number.

21600200666 is a deficient number, since it is larger than the sum of its proper divisors (13745582278).

21600200666 is a wasteful number, since it uses less digits than its factorization.

21600200666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981827316.

The product of its (nonzero) digits is 5184, while the sum is 29.

The spelling of 21600200666 in words is "twenty-one billion, six hundred million, two hundred thousand, six hundred sixty-six".