1221442254317 has 2 divisors, whose sum is σ = 1221442254318. Its totient is φ = 1221442254316.

The previous prime is 1221442254311. The next prime is 1221442254349. The reversal of 1221442254317 is 7134522441221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185864372676 + 35577881641 = 1088974^2 + 188621^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221442254317 - 2⁴ = 1221442254301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221442254311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721127158 + 610721127159.

It is an arithmetic number, because the mean of its divisors is an integer number (610721127159).

Almost surely, 2^{1221442254317} is an apocalyptic number.

It is an amenable number.

1221442254317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221442254317 is an equidigital number, since it uses as much as digits as its factorization.

1221442254317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 38.

Adding to 1221442254317 its reverse (7134522441221), we get a palindrome (8355964695538).

The spelling of 1221442254317 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, two hundred fifty-four thousand, three hundred seventeen".