51021040040 has 16 divisors (see below), whose sum is σ = 114797340180. Its totient is φ = 20408416000.

The previous prime is 51021040013. The next prime is 51021040123. The reversal of 51021040040 is 4004012015.

It can be written as a sum of positive squares in 2 ways, for example, as 46603310884 + 4417729156 = 215878^2 + 66466^2 .

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 3 ways as a sum of consecutive naturals, for example, 637762961 + ... + 637763040.

Almost surely, 2^51021040040 is an apocalyptic number.

It is an amenable number.

51021040040 is an abundant number, since it is smaller than the sum of its proper divisors (63776300140).

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

51021040040 is a wasteful number, since it uses less digits than its factorization.

51021040040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275526012 (or 1275526008 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 51021040040 its reverse (4004012015), we get a palindrome (55025052055).

The spelling of 51021040040 in words is "fifty-one billion, twenty-one million, forty thousand, forty".