1221199999073 has 2 divisors, whose sum is σ = 1221199999074. Its totient is φ = 1221199999072.

The previous prime is 1221199999039. The next prime is 1221199999079. The reversal of 1221199999073 is 3709999911221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888705914944 + 332494084129 = 942712^2 + 576623^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221199999073 - 2⁸ = 1221199998817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1221199998997 and 1221199999015.

It is not a weakly prime, because it can be changed into another prime (1221199999079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610599999536 + 610599999537.

It is an arithmetic number, because the mean of its divisors is an integer number (610599999537).

Almost surely, 2^{1221199999073} is an apocalyptic number.

It is an amenable number.

1221199999073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221199999073 is an equidigital number, since it uses as much as digits as its factorization.

1221199999073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4960116, while the sum is 62.

The spelling of 1221199999073 in words is "one trillion, two hundred twenty-one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, seventy-three".