21060660366 has 16 divisors (see below), whose sum is σ = 46801467600. Its totient is φ = 7020220104.

The previous prime is 21060660359. The next prime is 21060660367. The reversal of 21060660366 is 66306606012.

21060660366 is a `hidden beast` number, since 2 + 10 + 606 + 6 + 0 + 36 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21060660366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21060660367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195006061 + ... + 195006168.

It is an arithmetic number, because the mean of its divisors is an integer number (2925091725).

Almost surely, 2^21060660366 is an apocalyptic number.

21060660366 is an abundant number, since it is smaller than the sum of its proper divisors (25740807234).

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

21060660366 is a wasteful number, since it uses less digits than its factorization.

21060660366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390012240 (or 390012234 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 21060660366 in words is "twenty-one billion, sixty million, six hundred sixty thousand, three hundred sixty-six".