51221415001 has 2 divisors, whose sum is σ = 51221415002. Its totient is φ = 51221415000.

The previous prime is 51221414999. The next prime is 51221415059. The reversal of 51221415001 is 10051412215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43838309376 + 7383105625 = 209376^2 + 85925^2 .

It is a cyclic number.

It is not a de Polignac number, because 51221415001 - 2¹ = 51221414999 is a prime.

Together with 51221414999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51221425001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25610707500 + 25610707501.

It is an arithmetic number, because the mean of its divisors is an integer number (25610707501).

Almost surely, 2^51221415001 is an apocalyptic number.

It is an amenable number.

51221415001 is a deficient number, since it is larger than the sum of its proper divisors (1).

51221415001 is an equidigital number, since it uses as much as digits as its factorization.

51221415001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 51221415001 its reverse (10051412215), we get a palindrome (61272827216).

The spelling of 51221415001 in words is "fifty-one billion, two hundred twenty-one million, four hundred fifteen thousand, one".