2021121120 has 96 divisors (see below), whose sum is σ = 6373231200. Its totient is φ = 538398720.

The previous prime is 2021121107. The next prime is 2021121139. The reversal of 2021121120 is 211211202.

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 (12).

It is a junction number, because it is equal to n+sod(n) for n = 2021121096 and 2021121105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661356 + ... + 664404.

It is an arithmetic number, because the mean of its divisors is an integer number (66387825).

Almost surely, 2^2021121120 is an apocalyptic number.

2021121120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2021121120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3186615600).

2021121120 is an abundant number, since it is smaller than the sum of its proper divisors (4352110080).

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

2021121120 is a wasteful number, since it uses less digits than its factorization.

2021121120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4448 (or 4440 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2021121120 is about 44956.8806747087. The cubic root of 2021121120 is about 1264.3406855530.

Adding to 2021121120 its reverse (211211202), we get a palindrome (2232332322).

The spelling of 2021121120 in words is "two billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty".