51020606321 has 2 divisors, whose sum is σ = 51020606322. Its totient is φ = 51020606320.

The previous prime is 51020606317. The next prime is 51020606327. The reversal of 51020606321 is 12360602015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50485146721 + 535459600 = 224689^2 + 23140^2 .

It is a cyclic number.

It is not a de Polignac number, because 51020606321 - 2² = 51020606317 is a prime.

It is not a weakly prime, because it can be changed into another prime (51020606327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510303160 + 25510303161.

It is an arithmetic number, because the mean of its divisors is an integer number (25510303161).

Almost surely, 2^51020606321 is an apocalyptic number.

It is an amenable number.

51020606321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51020606321 is an equidigital number, since it uses as much as digits as its factorization.

51020606321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 51020606321 in words is "fifty-one billion, twenty million, six hundred six thousand, three hundred twenty-one".