51021040039 has 4 divisors (see below), whose sum is σ = 51045006960. Its totient is φ = 50997073120.

The previous prime is 51021040013. The next prime is 51021040123. The reversal of 51021040039 is 93004012015.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51021040039 - 2⁹ = 51021039527 is a prime.

It is a super-2 number, since 2×51021040039² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021039995 and 51021040022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021046039) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11980267 + ... + 11984524.

It is an arithmetic number, because the mean of its divisors is an integer number (12761251740).

Almost surely, 2^51021040039 is an apocalyptic number.

51021040039 is a deficient number, since it is larger than the sum of its proper divisors (23966921).

51021040039 is a wasteful number, since it uses less digits than its factorization.

51021040039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23966920.

The product of its (nonzero) digits is 1080, while the sum is 25.

The spelling of 51021040039 in words is "fifty-one billion, twenty-one million, forty thousand, thirty-nine".