51021039996 has 48 divisors (see below), whose sum is σ = 134772573600. Its totient is φ = 16686124416.

The previous prime is 51021039983. The next prime is 51021040013. The reversal of 51021039996 is 69993012015.

It is a happy number.

51021039996 is a `hidden beast` number, since 510 + 2 + 10 + 39 + 9 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4451041 + ... + 4462488.

It is an arithmetic number, because the mean of its divisors is an integer number (2807761950).

Almost surely, 2^51021039996 is an apocalyptic number.

It is an amenable number.

51021039996 is an abundant number, since it is smaller than the sum of its proper divisors (83751533604).

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

51021039996 is a wasteful number, since it uses less digits than its factorization.

51021039996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913595 (or 8913587 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The spelling of 51021039996 in words is "fifty-one billion, twenty-one million, thirty-nine thousand, nine hundred ninety-six".