2021212021212 has 72 divisors (see below), whose sum is σ = 5220396679680. Its totient is φ = 659178969120.

The previous prime is 2021212021207. The next prime is 2021212021219. The reversal of 2021212021212 is 2121202121202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021212021219) 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, 1806828 + ... + 2703155.

It is an arithmetic number, because the mean of its divisors is an integer number (72505509440).

Almost surely, 2^{2021212021212} is an apocalyptic number.

It is an amenable number.

2021212021212 is an abundant number, since it is smaller than the sum of its proper divisors (3199184658468).

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

2021212021212 is a wasteful number, since it uses less digits than its factorization.

2021212021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4510263 (or 4510258 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2021212021212 its reverse (2121202121202), we get a palindrome (4142414142414).

The spelling of 2021212021212 in words is "two trillion, twenty-one billion, two hundred twelve million, twenty-one thousand, two hundred twelve".