51021040005 has 72 divisors (see below), whose sum is σ = 100802988000. Its totient is φ = 23795980416.

The previous prime is 51021039983. The next prime is 51021040013. The reversal of 51021040005 is 50004012015.

51021040005 is a `hidden beast` number, since 51 + 0 + 210 + 400 + 0 + 5 = 666.

It is not a de Polignac number, because 51021040005 - 2⁷ = 51021039877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51021040005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32055 + ... + 321044.

It is an arithmetic number, because the mean of its divisors is an integer number (1400041500).

Almost surely, 2^51021040005 is an apocalyptic number.

It is an amenable number.

51021040005 is a deficient number, since it is larger than the sum of its proper divisors (49781947995).

51021040005 is a wasteful number, since it uses less digits than its factorization.

51021040005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353155 (or 353139 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The spelling of 51021040005 in words is "fifty-one billion, twenty-one million, forty thousand, five".