212121222020 has 48 divisors (see below), whose sum is σ = 450024277248. Its totient is φ = 83978966400.

The previous prime is 212121221999. The next prime is 212121222029. The reversal of 212121222020 is 20222121212.

It is a happy number.

212121222020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 212121222020.

It is not an unprimeable number, because it can be changed into a prime (212121222029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3888977 + ... + 3943143.

It is an arithmetic number, because the mean of its divisors is an integer number (9375505776).

Almost surely, 2^212121222020 is an apocalyptic number.

212121222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212121222020 is an abundant number, since it is smaller than the sum of its proper divisors (237903055228).

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

212121222020 is a wasteful number, since it uses less digits than its factorization.

212121222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56180 (or 56178 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212121222020 its reverse (20222121212), we get a palindrome (232343343232).

The spelling of 212121222020 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".