2121212202020 has 24 divisors (see below), whose sum is σ = 4473997798200. Its totient is φ = 844779704832.

The previous prime is 2121212202019. The next prime is 2121212202041. The reversal of 2121212202020 is 202022121212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 875149024036 + 1246063177984 = 935494^2 + 1116272^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2121212202020.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 231568805 + ... + 231577964.

It is an arithmetic number, because the mean of its divisors is an integer number (186416574925).

Almost surely, 2^{2121212202020} is an apocalyptic number.

2121212202020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121212202020 is an abundant number, since it is smaller than the sum of its proper divisors (2352785596180).

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

2121212202020 is a wasteful number, since it uses less digits than its factorization.

2121212202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463147007 (or 463147005 counting only the distinct ones).

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

Adding to 2121212202020 its reverse (202022121212), we get a palindrome (2323234323232).

It can be divided in two parts, 2121212 and 202020, that added together give a palindrome (2323232).

The spelling of 2121212202020 in words is "two trillion, one hundred twenty-one billion, two hundred twelve million, two hundred two thousand, twenty".