51021040127 has 2 divisors, whose sum is σ = 51021040128. Its totient is φ = 51021040126.

The previous prime is 51021040123. The next prime is 51021040171. The reversal of 51021040127 is 72104012015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51021040127 - 2² = 51021040123 is a prime.

It is a super-3 number, since 3×51021040127³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51021040123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510520063 + 25510520064.

It is an arithmetic number, because the mean of its divisors is an integer number (25510520064).

Almost surely, 2^51021040127 is an apocalyptic number.

51021040127 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021040127 is an equidigital number, since it uses as much as digits as its factorization.

51021040127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The spelling of 51021040127 in words is "fifty-one billion, twenty-one million, forty thousand, one hundred twenty-seven".