51021040042 has 8 divisors (see below), whose sum is σ = 87464640096. Its totient is φ = 21866160012.

The previous prime is 51021040013. The next prime is 51021040123. The reversal of 51021040042 is 24004012015.

51021040042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1822179988 + ... + 1822180015.

It is an arithmetic number, because the mean of its divisors is an integer number (10933080012).

Almost surely, 2^51021040042 is an apocalyptic number.

51021040042 is a deficient number, since it is larger than the sum of its proper divisors (36443600054).

51021040042 is a wasteful number, since it uses less digits than its factorization.

51021040042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644360012.

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 51021040042 its reverse (24004012015), we get a palindrome (75025052057).

The spelling of 51021040042 in words is "fifty-one billion, twenty-one million, forty thousand, forty-two".