51021040023 has 10 divisors (see below), whose sum is σ = 76216615464. Its totient is φ = 34014026628.

The previous prime is 51021040013. The next prime is 51021040123. The reversal of 51021040023 is 32004012015.

51021040023 is a `hidden beast` number, since 51 + 0 + 210 + 400 + 2 + 3 = 666.

It is not a de Polignac number, because 51021040023 - 2¹² = 51021035927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51021039978 and 51021040005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021040013) 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 9 ways as a sum of consecutive naturals, for example, 314944611 + ... + 314944772.

Almost surely, 2^51021040023 is an apocalyptic number.

51021040023 is a deficient number, since it is larger than the sum of its proper divisors (25195575441).

51021040023 is an equidigital number, since it uses as much as digits as its factorization.

51021040023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629889395 (or 629889386 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 51021040023 its reverse (32004012015), we get a palindrome (83025052038).

The spelling of 51021040023 in words is "fifty-one billion, twenty-one million, forty thousand, twenty-three".