1221303120379 has 2 divisors, whose sum is σ = 1221303120380. Its totient is φ = 1221303120378.

The previous prime is 1221303120311. The next prime is 1221303120409. The reversal of 1221303120379 is 9730213031221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221303120379 - 2⁷ = 1221303120251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221303120679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610651560189 + 610651560190.

It is an arithmetic number, because the mean of its divisors is an integer number (610651560190).

Almost surely, 2^{1221303120379} is an apocalyptic number.

1221303120379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221303120379 is an equidigital number, since it uses as much as digits as its factorization.

1221303120379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The spelling of 1221303120379 in words is "one trillion, two hundred twenty-one billion, three hundred three million, one hundred twenty thousand, three hundred seventy-nine".