51241222121 has 2 divisors, whose sum is σ = 51241222122. Its totient is φ = 51241222120.

The previous prime is 51241222117. The next prime is 51241222177. The reversal of 51241222121 is 12122214215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50802906025 + 438316096 = 225395^2 + 20936^2 .

It is a cyclic number.

It is not a de Polignac number, because 51241222121 - 2² = 51241222117 is a prime.

It is not a weakly prime, because it can be changed into another prime (51241222111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25620611060 + 25620611061.

It is an arithmetic number, because the mean of its divisors is an integer number (25620611061).

Almost surely, 2^51241222121 is an apocalyptic number.

It is an amenable number.

51241222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

51241222121 is an equidigital number, since it uses as much as digits as its factorization.

51241222121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 640, while the sum is 23.

Adding to 51241222121 its reverse (12122214215), we get a palindrome (63363436336).

The spelling of 51241222121 in words is "fifty-one billion, two hundred forty-one million, two hundred twenty-two thousand, one hundred twenty-one".