120771721 has 12 divisors (see below), whose sum is σ = 142590288. Its totient is φ = 101970792.

The previous prime is 120771713. The next prime is 120771731. The reversal of 120771721 is 127177021.

It is not a de Polignac number, because 120771721 - 2³ = 120771713 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 120771721.

It is not an unprimeable number, because it can be changed into a prime (120771731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15111 + ... + 21676.

It is an arithmetic number, because the mean of its divisors is an integer number (11882524).

Almost surely, 2^120771721 is an apocalyptic number.

It is an amenable number.

120771721 is a deficient number, since it is larger than the sum of its proper divisors (21818567).

120771721 is an equidigital number, since it uses as much as digits as its factorization.

120771721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36868 (or 36861 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 120771721 is about 10989.6187831972. The cubic root of 120771721 is about 494.2975050170.

The spelling of 120771721 in words is "one hundred twenty million, seven hundred seventy-one thousand, seven hundred twenty-one".