51021510019 has 2 divisors, whose sum is σ = 51021510020. Its totient is φ = 51021510018.

The previous prime is 51021510011. The next prime is 51021510061. The reversal of 51021510019 is 91001512015.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51021510019 - 2³ = 51021510011 is a prime.

It is a super-2 number, since 2×51021510019² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51021509975 and 51021510002.

It is not a weakly prime, because it can be changed into another prime (51021510011) 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 as a sum of consecutive naturals, namely, 25510755009 + 25510755010.

It is an arithmetic number, because the mean of its divisors is an integer number (25510755010).

Almost surely, 2^51021510019 is an apocalyptic number.

51021510019 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021510019 is an equidigital number, since it uses as much as digits as its factorization.

51021510019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 25.

The spelling of 51021510019 in words is "fifty-one billion, twenty-one million, five hundred ten thousand, nineteen".