21641664327116 has 12 divisors (see below), whose sum is σ = 37879537225488. Its totient is φ = 10818939405552.

The previous prime is 21641664327103. The next prime is 21641664327181. The reversal of 21641664327116 is 61172346614612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473163776 + ... + 473209511.

It is an arithmetic number, because the mean of its divisors is an integer number (3156628102124).

Almost surely, 2^{21641664327116} is an apocalyptic number.

It is an amenable number.

21641664327116 is a deficient number, since it is larger than the sum of its proper divisors (16237872898372).

21641664327116 is a wasteful number, since it uses less digits than its factorization.

21641664327116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946379008 (or 946379006 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The spelling of 21641664327116 in words is "twenty-one trillion, six hundred forty-one billion, six hundred sixty-four million, three hundred twenty-seven thousand, one hundred sixteen".