1312121550521 has 2 divisors, whose sum is σ = 1312121550522. Its totient is φ = 1312121550520.

The previous prime is 1312121550491. The next prime is 1312121550559. The reversal of 1312121550521 is 1250551212131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308360794896 + 3760755625 = 1143836^2 + 61325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312121550521 - 2¹⁸ = 1312121288377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312121570521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656060775260 + 656060775261.

It is an arithmetic number, because the mean of its divisors is an integer number (656060775261).

Almost surely, 2^{1312121550521} is an apocalyptic number.

It is an amenable number.

1312121550521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312121550521 is an equidigital number, since it uses as much as digits as its factorization.

1312121550521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 29.

Adding to 1312121550521 its reverse (1250551212131), we get a palindrome (2562672762652).

The spelling of 1312121550521 in words is "one trillion, three hundred twelve billion, one hundred twenty-one million, five hundred fifty thousand, five hundred twenty-one".