50136547921 has 2 divisors, whose sum is σ = 50136547922. Its totient is φ = 50136547920.

The previous prime is 50136547919. The next prime is 50136547927. The reversal of 50136547921 is 12974563105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46974060225 + 3162487696 = 216735^2 + 56236^2 .

It is a cyclic number.

It is not a de Polignac number, because 50136547921 - 2¹ = 50136547919 is a prime.

Together with 50136547919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (50136547927) 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, 25068273960 + 25068273961.

It is an arithmetic number, because the mean of its divisors is an integer number (25068273961).

Almost surely, 2^50136547921 is an apocalyptic number.

It is an amenable number.

50136547921 is a deficient number, since it is larger than the sum of its proper divisors (1).

50136547921 is an equidigital number, since it uses as much as digits as its factorization.

50136547921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 50136547921 in words is "fifty billion, one hundred thirty-six million, five hundred forty-seven thousand, nine hundred twenty-one".