120871721 has 8 divisors (see below), whose sum is σ = 122805960. Its totient is φ = 118945152.

The previous prime is 120871669. The next prime is 120871741. The reversal of 120871721 is 127178021.

It can be written as a sum of positive squares in 4 ways, for example, as 80371225 + 40500496 = 8965^2 + 6364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120871721 - 2⁶ = 120871657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (120871741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35531 + ... + 38783.

It is an arithmetic number, because the mean of its divisors is an integer number (15350745).

Almost surely, 2^120871721 is an apocalyptic number.

It is an amenable number.

120871721 is a deficient number, since it is larger than the sum of its proper divisors (1934239).

120871721 is an equidigital number, since it uses as much as digits as its factorization.

120871721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835.

The product of its (nonzero) digits is 1568, while the sum is 29.

The square root of 120871721 is about 10994.1675901361. The cubic root of 120871721 is about 494.4338948761.

The spelling of 120871721 in words is "one hundred twenty million, eight hundred seventy-one thousand, seven hundred twenty-one".