1221442254079 has 2 divisors, whose sum is σ = 1221442254080. Its totient is φ = 1221442254078.

The previous prime is 1221442254077. The next prime is 1221442254089. The reversal of 1221442254079 is 9704522441221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221442254079 - 2¹ = 1221442254077 is a prime.

Together with 1221442254077, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221442254073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610721127039 + 610721127040.

It is an arithmetic number, because the mean of its divisors is an integer number (610721127040).

Almost surely, 2^{1221442254079} is an apocalyptic number.

1221442254079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221442254079 is an equidigital number, since it uses as much as digits as its factorization.

1221442254079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 1221442254079 in words is "one trillion, two hundred twenty-one billion, four hundred forty-two million, two hundred fifty-four thousand, seventy-nine".