1351051242221 has 2 divisors, whose sum is σ = 1351051242222. Its totient is φ = 1351051242220.

The previous prime is 1351051242209. The next prime is 1351051242241. The reversal of 1351051242221 is 1222421501531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 908706534121 + 442344708100 = 953261^2 + 665090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351051242221 - 2²⁶ = 1350984133357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351051242241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675525621110 + 675525621111.

It is an arithmetic number, because the mean of its divisors is an integer number (675525621111).

Almost surely, 2^{1351051242221} is an apocalyptic number.

It is an amenable number.

1351051242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351051242221 is an equidigital number, since it uses as much as digits as its factorization.

1351051242221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

Adding to 1351051242221 its reverse (1222421501531), we get a palindrome (2573472743752).

The spelling of 1351051242221 in words is "one trillion, three hundred fifty-one billion, fifty-one million, two hundred forty-two thousand, two hundred twenty-one".