1351244040221 has 2 divisors, whose sum is σ = 1351244040222. Its totient is φ = 1351244040220.

The previous prime is 1351244040193. The next prime is 1351244040227. The reversal of 1351244040221 is 1220404421531.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236234883321 + 115009156900 = 1111861^2 + 339130^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1351244040221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351244040227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675622020110 + 675622020111.

It is an arithmetic number, because the mean of its divisors is an integer number (675622020111).

Almost surely, 2^{1351244040221} is an apocalyptic number.

It is an amenable number.

1351244040221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351244040221 is an equidigital number, since it uses as much as digits as its factorization.

1351244040221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 1351244040221 its reverse (1220404421531), we get a palindrome (2571648461752).

The spelling of 1351244040221 in words is "one trillion, three hundred fifty-one billion, two hundred forty-four million, forty thousand, two hundred twenty-one".