21104866763128 has 32 divisors (see below), whose sum is σ = 39796656246000. Its totient is φ = 10492546210560.

The previous prime is 21104866763117. The next prime is 21104866763159. The reversal of 21104866763128 is 82136766840112.

It is a congruent number.

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, 6174918 + ... + 8963221.

Almost surely, 2^{21104866763128} is an apocalyptic number.

It is an amenable number.

21104866763128 is a deficient number, since it is larger than the sum of its proper divisors (18691789482872).

21104866763128 is a wasteful number, since it uses less digits than its factorization.

21104866763128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15139135 (or 15139131 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 21104866763128 in words is "twenty-one trillion, one hundred four billion, eight hundred sixty-six million, seven hundred sixty-three thousand, one hundred twenty-eight".