120921 has 8 divisors (see below), whose sum is σ = 170784. Its totient is φ = 75840.

The previous prime is 120919. The next prime is 120929. The reversal of 120921 is 129021.

It is a happy number.

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

It is not a de Polignac number, because 120921 - 2¹ = 120919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 120921.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 120921.

It is not an unprimeable number, because it can be changed into a prime (120929) 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, 1135 + ... + 1236.

It is an arithmetic number, because the mean of its divisors is an integer number (21348).

2¹²⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

120921 is a deficient number, since it is larger than the sum of its proper divisors (49863).

120921 is a wasteful number, since it uses less digits than its factorization.

120921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 120921 is about 347.7369695618. The cubic root of 120921 is about 49.4501078767.

Adding to 120921 its reverse (129021), we get a palindrome (249942).

Subtracting 120921 from its reverse (129021), we obtain a square (8100 = 90²).

The spelling of 120921 in words is "one hundred twenty thousand, nine hundred twenty-one".