50213517721 has 2 divisors, whose sum is σ = 50213517722. Its totient is φ = 50213517720.

The previous prime is 50213517671. The next prime is 50213517751. The reversal of 50213517721 is 12771531205.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50202883600 + 10634121 = 224060^2 + 3261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50213517721 is a prime.

It is not a weakly prime, because it can be changed into another prime (50213517751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25106758860 + 25106758861.

It is an arithmetic number, because the mean of its divisors is an integer number (25106758861).

Almost surely, 2^50213517721 is an apocalyptic number.

It is an amenable number.

50213517721 is a deficient number, since it is larger than the sum of its proper divisors (1).

50213517721 is an equidigital number, since it uses as much as digits as its factorization.

50213517721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14700, while the sum is 34.

The spelling of 50213517721 in words is "fifty billion, two hundred thirteen million, five hundred seventeen thousand, seven hundred twenty-one".