2121020222020 has 72 divisors (see below), whose sum is σ = 5231654011584. Its totient is φ = 720146637504.

The previous prime is 2121020222011. The next prime is 2121020222023. The reversal of 2121020222020 is 202220201212.

It is a junction number, because it is equal to n+sod(n) for n = 2121020221985 and 2121020222003.

It is not an unprimeable number, because it can be changed into a prime (2121020222023) 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, 10405402 + ... + 10607281.

It is an arithmetic number, because the mean of its divisors is an integer number (72661861272).

Almost surely, 2^{2121020222020} is an apocalyptic number.

2121020222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121020222020 is an abundant number, since it is smaller than the sum of its proper divisors (3110633789564).

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

2121020222020 is a wasteful number, since it uses less digits than its factorization.

2121020222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21012809 (or 21012800 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2121020222020 its reverse (202220201212), we get a palindrome (2323240423232).

The spelling of 2121020222020 in words is "two trillion, one hundred twenty-one billion, twenty million, two hundred twenty-two thousand, twenty".