51021040123 has 2 divisors, whose sum is σ = 51021040124. Its totient is φ = 51021040122.

The previous prime is 51021040013. The next prime is 51021040127. The reversal of 51021040123 is 32104012015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51021040123 - 2¹³ = 51021031931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51021040123.

It is not a weakly prime, because it can be changed into another prime (51021040127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510520061 + 25510520062.

It is an arithmetic number, because the mean of its divisors is an integer number (25510520062).

Almost surely, 2^51021040123 is an apocalyptic number.

51021040123 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021040123 is an equidigital number, since it uses as much as digits as its factorization.

51021040123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 51021040123 its reverse (32104012015), we get a palindrome (83125052138).

The spelling of 51021040123 in words is "fifty-one billion, twenty-one million, forty thousand, one hundred twenty-three".