2021220012 has 72 divisors (see below), whose sum is σ = 5510087856. Its totient is φ = 574973952.

The previous prime is 2021219983. The next prime is 2021220017. The reversal of 2021220012 is 2100221202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 2021220012.

It is not an unprimeable number, because it can be changed into a prime (2021220017) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 129628 + ... + 144380.

It is an arithmetic number, because the mean of its divisors is an integer number (76528998).

Almost surely, 2^2021220012 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 2021220012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2755043928).

2021220012 is an abundant number, since it is smaller than the sum of its proper divisors (3488867844).

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

2021220012 is a wasteful number, since it uses less digits than its factorization.

2021220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15007 (or 14998 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2021220012 is about 44957.9805151432. The cubic root of 2021220012 is about 1264.3613063095.

Adding to 2021220012 its reverse (2100221202), we get a palindrome (4121441214).

The spelling of 2021220012 in words is "two billion, twenty-one million, two hundred twenty thousand, twelve".