120999999991973 has 2 divisors, whose sum is σ = 120999999991974. Its totient is φ = 120999999991972.

The previous prime is 120999999991963. The next prime is 120999999992017. The reversal of 120999999991973 is 379199999999021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120817754674369 + 182245317604 = 10991713^2 + 426902^2 .

It is a cyclic number.

It is not a de Polignac number, because 120999999991973 - 2⁴⁶ = 50631255814309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (120999999991943) 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, 60499999995986 + 60499999995987.

It is an arithmetic number, because the mean of its divisors is an integer number (60499999995987).

Almost surely, 2^{120999999991973} is an apocalyptic number.

It is an amenable number.

120999999991973 is a deficient number, since it is larger than the sum of its proper divisors (1).

120999999991973 is an equidigital number, since it uses as much as digits as its factorization.

120999999991973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16271660538, while the sum is 95.

The spelling of 120999999991973 in words is "one hundred twenty trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, nine hundred seventy-three".