1221679579403 has 2 divisors, whose sum is σ = 1221679579404. Its totient is φ = 1221679579402.

The previous prime is 1221679579381. The next prime is 1221679579411. The reversal of 1221679579403 is 3049759761221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221679579403 - 2²⁸ = 1221411143947 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221679578403) 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, 610839789701 + 610839789702.

It is an arithmetic number, because the mean of its divisors is an integer number (610839789702).

Almost surely, 2^{1221679579403} is an apocalyptic number.

1221679579403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221679579403 is an equidigital number, since it uses as much as digits as its factorization.

1221679579403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 56.

The spelling of 1221679579403 in words is "one trillion, two hundred twenty-one billion, six hundred seventy-nine million, five hundred seventy-nine thousand, four hundred three".