120755056171721 has 4 divisors (see below), whose sum is σ = 123700301444244. Its totient is φ = 117809810899200.

The previous prime is 120755056171697. The next prime is 120755056171741. The reversal of 120755056171721 is 127171650557021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57295271364496 + 63459784807225 = 7569364^2 + 7966165^2 .

It is a cyclic number.

It is not a de Polignac number, because 120755056171721 - 2¹⁸ = 120755055909577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120755056171721.

It is not an unprimeable number, because it can be changed into a prime (120755056171741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1472622636200 + ... + 1472622636281.

It is an arithmetic number, because the mean of its divisors is an integer number (30925075361061).

Almost surely, 2^{120755056171721} is an apocalyptic number.

It is an amenable number.

120755056171721 is a deficient number, since it is larger than the sum of its proper divisors (2945245272523).

120755056171721 is an equidigital number, since it uses as much as digits as its factorization.

120755056171721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2945245272522.

The product of its (nonzero) digits is 1029000, while the sum is 50.

The spelling of 120755056171721 in words is "one hundred twenty trillion, seven hundred fifty-five billion, fifty-six million, one hundred seventy-one thousand, seven hundred twenty-one".