2021111120 has 80 divisors (see below), whose sum is σ = 5384500608. Its totient is φ = 691130880.

The previous prime is 2021111047. The next prime is 2021111159. The reversal of 2021111120 is 211111202.

It is a tau number, because it is divible by the number of its divisors (80).

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, 217775 + ... + 226865.

Almost surely, 2^2021111120 is an apocalyptic number.

2021111120 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 2021111120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2692250304).

2021111120 is an abundant number, since it is smaller than the sum of its proper divisors (3363389488).

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

2021111120 is a wasteful number, since it uses less digits than its factorization.

2021111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9508 (or 9502 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 2021111120 is about 44956.7694568905. The cubic root of 2021111120 is about 1264.3386003361.

Adding to 2021111120 its reverse (211111202), we get a palindrome (2232222322).

The spelling of 2021111120 in words is "two billion, twenty-one million, one hundred eleven thousand, one hundred twenty".