51021520012 has 12 divisors (see below), whose sum is σ = 89969246136. Its totient is φ = 25316021120.

The previous prime is 51021520009. The next prime is 51021520019. The reversal of 51021520012 is 21002512015.

51021520012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51021520019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48684133 + ... + 48685180.

It is an arithmetic number, because the mean of its divisors is an integer number (7497437178).

Almost surely, 2^51021520012 is an apocalyptic number.

It is an amenable number.

51021520012 is a deficient number, since it is larger than the sum of its proper divisors (38947726124).

51021520012 is a wasteful number, since it uses less digits than its factorization.

51021520012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97369448 (or 97369446 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The spelling of 51021520012 in words is "fifty-one billion, twenty-one million, five hundred twenty thousand, twelve".