51103005313721 has 2 divisors, whose sum is σ = 51103005313722. Its totient is φ = 51103005313720.

The previous prime is 51103005313697. The next prime is 51103005313729. The reversal of 51103005313721 is 12731350030115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50873697456400 + 229307857321 = 7132580^2 + 478861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51103005313721 is a prime.

It is a super-2 number, since 2×51103005313721² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51103005313729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25551502656860 + 25551502656861.

It is an arithmetic number, because the mean of its divisors is an integer number (25551502656861).

Almost surely, 2^{51103005313721} is an apocalyptic number.

It is an amenable number.

51103005313721 is a deficient number, since it is larger than the sum of its proper divisors (1).

51103005313721 is an equidigital number, since it uses as much as digits as its factorization.

51103005313721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450, while the sum is 32.

Adding to 51103005313721 its reverse (12731350030115), we get a palindrome (63834355343836).

The spelling of 51103005313721 in words is "fifty-one trillion, one hundred three billion, five million, three hundred thirteen thousand, seven hundred twenty-one".