21128061334176 has 72 divisors (see below), whose sum is σ = 61067890443924. Its totient is φ = 6927233218560.

The previous prime is 21128061334157. The next prime is 21128061334183. The reversal of 21128061334176 is 67143316082112.

21128061334176 is a `hidden beast` number, since 2 + 1 + 1 + 28 + 0 + 613 + 3 + 4 + 1 + 7 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16511837202576 + 4616224131600 = 4063476^2 + 2148540^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 601304761 + ... + 601339896.

Almost surely, 2^{21128061334176} is an apocalyptic number.

It is an amenable number.

21128061334176 is an abundant number, since it is smaller than the sum of its proper divisors (39939829109748).

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

21128061334176 is a wasteful number, since it uses less digits than its factorization.

21128061334176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202644734 (or 1202644723 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 21128061334176 in words is "twenty-one trillion, one hundred twenty-eight billion, sixty-one million, three hundred thirty-four thousand, one hundred seventy-six".