120721851051217 has 24 divisors (see below), whose sum is σ = 131057167916160. Its totient is φ = 111150369195840.

The previous prime is 120721851051199. The next prime is 120721851051223. The reversal of 120721851051217 is 712150158127021.

It is not a de Polignac number, because 120721851051217 - 2⁷ = 120721851051089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120721851051317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307111323 + ... + 307504159.

It is an arithmetic number, because the mean of its divisors is an integer number (5460715329840).

Almost surely, 2^{120721851051217} is an apocalyptic number.

It is an amenable number.

120721851051217 is a deficient number, since it is larger than the sum of its proper divisors (10335316864943).

120721851051217 is a wasteful number, since it uses less digits than its factorization.

120721851051217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397513 (or 397500 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 43.

The spelling of 120721851051217 in words is "one hundred twenty trillion, seven hundred twenty-one billion, eight hundred fifty-one million, fifty-one thousand, two hundred seventeen".