51013055221 has 2 divisors, whose sum is σ = 51013055222. Its totient is φ = 51013055220.

The previous prime is 51013055153. The next prime is 51013055239. The reversal of 51013055221 is 12255031015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34823292100 + 16189763121 = 186610^2 + 127239^2 .

It is a cyclic number.

It is not a de Polignac number, because 51013055221 - 2⁹ = 51013054709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51013025221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506527610 + 25506527611.

It is an arithmetic number, because the mean of its divisors is an integer number (25506527611).

Almost surely, 2^51013055221 is an apocalyptic number.

It is an amenable number.

51013055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

51013055221 is an equidigital number, since it uses as much as digits as its factorization.

51013055221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 51013055221 its reverse (12255031015), we get a palindrome (63268086236).

The spelling of 51013055221 in words is "fifty-one billion, thirteen million, fifty-five thousand, two hundred twenty-one".