2021110111020 has 768 divisors, whose sum is σ = 8063077478400. Its totient is φ = 364051169280.

The previous prime is 2021110110983. The next prime is 2021110111039. The reversal of 2021110111020 is 201110111202.

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 = 2021110110987 and 2021110111005.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 519697236 + ... + 519701124.

It is an arithmetic number, because the mean of its divisors is an integer number (10498798800).

Almost surely, 2^{2021110111020} is an apocalyptic number.

2021110111020 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 2021110111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4031538739200).

2021110111020 is an abundant number, since it is smaller than the sum of its proper divisors (6041967367380).

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

2021110111020 is a wasteful number, since it uses less digits than its factorization.

2021110111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4458 (or 4456 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2021110111020 its reverse (201110111202), we get a palindrome (2222220222222).

The spelling of 2021110111020 in words is "two trillion, twenty-one billion, one hundred ten million, one hundred eleven thousand, twenty".