50891190221 has 2 divisors, whose sum is σ = 50891190222. Its totient is φ = 50891190220.

The previous prime is 50891190179. The next prime is 50891190239. The reversal of 50891190221 is 12209119805.

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., 42516378025 + 8374812196 = 206195^2 + 91514^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50891190221 is a prime.

It is a super-2 number, since 2×50891190221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50891192221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25445595110 + 25445595111.

It is an arithmetic number, because the mean of its divisors is an integer number (25445595111).

Almost surely, 2^50891190221 is an apocalyptic number.

It is an amenable number.

50891190221 is a deficient number, since it is larger than the sum of its proper divisors (1).

50891190221 is an equidigital number, since it uses as much as digits as its factorization.

50891190221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 50891190221 in words is "fifty billion, eight hundred ninety-one million, one hundred ninety thousand, two hundred twenty-one".