50721821 has 2 divisors, whose sum is σ = 50721822. Its totient is φ = 50721820.

The previous prime is 50721791. The next prime is 50721889. The reversal of 50721821 is 12812705.

50721821 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., 50623225 + 98596 = 7115^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 50721821 - 2⁶ = 50721757 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50721221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25360910 + 25360911.

It is an arithmetic number, because the mean of its divisors is an integer number (25360911).

Almost surely, 2^50721821 is an apocalyptic number.

It is an amenable number.

50721821 is a deficient number, since it is larger than the sum of its proper divisors (1).

50721821 is an equidigital number, since it uses as much as digits as its factorization.

50721821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 50721821 is about 7121.9253716955. The cubic root of 50721821 is about 370.1674941686.

The spelling of 50721821 in words is "fifty million, seven hundred twenty-one thousand, eight hundred twenty-one".