51241225201321 has 2 divisors, whose sum is σ = 51241225201322. Its totient is φ = 51241225201320.

The previous prime is 51241225201319. The next prime is 51241225201433. The reversal of 51241225201321 is 12310252214215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39696615275625 + 11544609925696 = 6300525^2 + 3397736^2 .

It is a cyclic number.

It is not a de Polignac number, because 51241225201321 - 2¹ = 51241225201319 is a prime.

Together with 51241225201319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51241225201021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25620612600660 + 25620612600661.

It is an arithmetic number, because the mean of its divisors is an integer number (25620612600661).

Almost surely, 2^{51241225201321} is an apocalyptic number.

It is an amenable number.

51241225201321 is a deficient number, since it is larger than the sum of its proper divisors (1).

51241225201321 is an equidigital number, since it uses as much as digits as its factorization.

51241225201321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 51241225201321 its reverse (12310252214215), we get a palindrome (63551477415536).

The spelling of 51241225201321 in words is "fifty-one trillion, two hundred forty-one billion, two hundred twenty-five million, two hundred one thousand, three hundred twenty-one".