921120 has 96 divisors (see below), whose sum is σ = 3084480. Its totient is φ = 230400.

The previous prime is 921091. The next prime is 921121. The reversal of 921120 is 21129.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 921120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9070 + ... + 9170.

It is an arithmetic number, because the mean of its divisors is an integer number (32130).

2⁹²¹¹²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1542240).

921120 is an abundant number, since it is smaller than the sum of its proper divisors (2163360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921120 is a wasteful number, since it uses less digits than its factorization.

921120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 130 counting only the distinct ones).

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

The square root of 921120 is about 959.7499674394. The cubic root of 921120 is about 97.2983339896.

Adding to 921120 its reverse (21129), we get a palindrome (942249).

The spelling of 921120 in words is "nine hundred twenty-one thousand, one hundred twenty".