1221341676563 has 2 divisors, whose sum is σ = 1221341676564. Its totient is φ = 1221341676562.

The previous prime is 1221341676557. The next prime is 1221341676601. The reversal of 1221341676563 is 3656761431221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221341676563 - 2²⁰ = 1221340627987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221341679563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610670838281 + 610670838282.

It is an arithmetic number, because the mean of its divisors is an integer number (610670838282).

Almost surely, 2^{1221341676563} is an apocalyptic number.

1221341676563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221341676563 is an equidigital number, since it uses as much as digits as its factorization.

1221341676563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The spelling of 1221341676563 in words is "one trillion, two hundred twenty-one billion, three hundred forty-one million, six hundred seventy-six thousand, five hundred sixty-three".