50445521221 has 2 divisors, whose sum is σ = 50445521222. Its totient is φ = 50445521220.

The previous prime is 50445521219. The next prime is 50445521233. The reversal of 50445521221 is 12212554405.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47740065025 + 2705456196 = 218495^2 + 52014^2 .

It is a cyclic number.

It is not a de Polignac number, because 50445521221 - 2¹ = 50445521219 is a prime.

It is a super-2 number, since 2×50445521221² (a number of 22 digits) contains 22 as substring.

Together with 50445521219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50445521281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25222760610 + 25222760611.

It is an arithmetic number, because the mean of its divisors is an integer number (25222760611).

Almost surely, 2^50445521221 is an apocalyptic number.

It is an amenable number.

50445521221 is a deficient number, since it is larger than the sum of its proper divisors (1).

50445521221 is an equidigital number, since it uses as much as digits as its factorization.

50445521221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 50445521221 in words is "fifty billion, four hundred forty-five million, five hundred twenty-one thousand, two hundred twenty-one".