21660402066130 has 16 divisors (see below), whose sum is σ = 39115722824640. Its totient is φ = 8635938802992.

The previous prime is 21660402066091. The next prime is 21660402066157. The reversal of 21660402066130 is 3166020406612.

It is a self number, because there is not a number n which added to its sum of digits gives 21660402066130.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3527749710 + ... + 3527755849.

It is an arithmetic number, because the mean of its divisors is an integer number (2444732676540).

Almost surely, 2^{21660402066130} is an apocalyptic number.

21660402066130 is a deficient number, since it is larger than the sum of its proper divisors (17455320758510).

21660402066130 is a wasteful number, since it uses less digits than its factorization.

21660402066130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7055505873.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 21660402066130 in words is "twenty-one trillion, six hundred sixty billion, four hundred two million, sixty-six thousand, one hundred thirty".