2021012020 has 96 divisors (see below), whose sum is σ = 4575826080. Its totient is φ = 747110400.

The previous prime is 2021012009. The next prime is 2021012033. The reversal of 2021012020 is 202101202.

It can be written as a sum of positive squares in 16 ways, for example, as 583995556 + 1437016464 = 24166^2 + 37908^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2021011988 and 2021012006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7863732 + ... + 7863988.

It is an arithmetic number, because the mean of its divisors is an integer number (47664855).

Almost surely, 2^2021012020 is an apocalyptic number.

2021012020 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 2021012020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2287913040).

2021012020 is an abundant number, since it is smaller than the sum of its proper divisors (2554814060).

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

2021012020 is a wasteful number, since it uses less digits than its factorization.

2021012020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613 (or 611 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2021012020 is about 44955.6672734373. The cubic root of 2021012020 is about 1264.3179354648.

2021012020 divided by its sum of digits (10) gives a palindrome (202101202).

Adding to 2021012020 its reverse (202101202), we get a palindrome (2223113222).

The spelling of 2021012020 in words is "two billion, twenty-one million, twelve thousand, twenty".