120665621 has 8 divisors (see below), whose sum is σ = 124907520. Its totient is φ = 116475408.

The previous prime is 120665579. The next prime is 120665651. The reversal of 120665621 is 126566021.

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

It is not a de Polignac number, because 120665621 - 2⁶ = 120665557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120665651) 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 7 ways as a sum of consecutive naturals, for example, 8141 + ... + 17538.

It is an arithmetic number, because the mean of its divisors is an integer number (15613440).

Almost surely, 2^120665621 is an apocalyptic number.

It is an amenable number.

120665621 is a deficient number, since it is larger than the sum of its proper divisors (4241899).

120665621 is a wasteful number, since it uses less digits than its factorization.

120665621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25843.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 120665621 is about 10984.7904395123. The cubic root of 120665621 is about 494.1527130346.

The spelling of 120665621 in words is "one hundred twenty million, six hundred sixty-five thousand, six hundred twenty-one".