51021509933 has 2 divisors, whose sum is σ = 51021509934. Its totient is φ = 51021509932.

The previous prime is 51021509897. The next prime is 51021509941. The reversal of 51021509933 is 33990512015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48778256164 + 2243253769 = 220858^2 + 47363^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021509933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51021509953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510754966 + 25510754967.

It is an arithmetic number, because the mean of its divisors is an integer number (25510754967).

Almost surely, 2^51021509933 is an apocalyptic number.

It is an amenable number.

51021509933 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021509933 is an equidigital number, since it uses as much as digits as its factorization.

51021509933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36450, while the sum is 38.

The spelling of 51021509933 in words is "fifty-one billion, twenty-one million, five hundred nine thousand, nine hundred thirty-three".