50021253281 has 2 divisors, whose sum is σ = 50021253282. Its totient is φ = 50021253280.

The previous prime is 50021253211. The next prime is 50021253301. The reversal of 50021253281 is 18235212005.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42185462881 + 7835790400 = 205391^2 + 88520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50021253281 is a prime.

It is a super-2 number, since 2×50021253281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (50021253211) 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, 25010626640 + 25010626641.

It is an arithmetic number, because the mean of its divisors is an integer number (25010626641).

Almost surely, 2^50021253281 is an apocalyptic number.

It is an amenable number.

50021253281 is a deficient number, since it is larger than the sum of its proper divisors (1).

50021253281 is an equidigital number, since it uses as much as digits as its factorization.

50021253281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 50021253281 its reverse (18235212005), we get a palindrome (68256465286).

The spelling of 50021253281 in words is "fifty billion, twenty-one million, two hundred fifty-three thousand, two hundred eighty-one".