51042140020 has 12 divisors (see below), whose sum is σ = 107188494084. Its totient is φ = 20416856000.

The previous prime is 51042139931. The next prime is 51042140027. The reversal of 51042140020 is 2004124015.

It can be written as a sum of positive squares in 2 ways, for example, as 9278312976 + 41763827044 = 96324^2 + 204362^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51042140020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51042140027) 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, 1276053481 + ... + 1276053520.

It is an arithmetic number, because the mean of its divisors is an integer number (8932374507).

Almost surely, 2^51042140020 is an apocalyptic number.

It is an amenable number.

51042140020 is an abundant number, since it is smaller than the sum of its proper divisors (56146354064).

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

51042140020 is a wasteful number, since it uses less digits than its factorization.

51042140020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2552107010 (or 2552107008 counting only the distinct ones).

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

Adding to 51042140020 its reverse (2004124015), we get a palindrome (53046264035).

The spelling of 51042140020 in words is "fifty-one billion, forty-two million, one hundred forty thousand, twenty".