51021040013 has 2 divisors, whose sum is σ = 51021040014. Its totient is φ = 51021040012.

The previous prime is 51021039983. The next prime is 51021040123. The reversal of 51021040013 is 31004012015.

51021040013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34923013129 + 16098026884 = 186877^2 + 126878^2 .

It is a cyclic number.

It is not a de Polignac number, because 51021040013 - 2¹⁴ = 51021023629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51021039973 and 51021040000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51021040913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510520006 + 25510520007.

It is an arithmetic number, because the mean of its divisors is an integer number (25510520007).

Almost surely, 2^51021040013 is an apocalyptic number.

It is an amenable number.

51021040013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021040013 is an equidigital number, since it uses as much as digits as its factorization.

51021040013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 51021040013 its reverse (31004012015), we get a palindrome (82025052028).

The spelling of 51021040013 in words is "fifty-one billion, twenty-one million, forty thousand, thirteen".