2121102020 has 12 divisors (see below), whose sum is σ = 4454314284. Its totient is φ = 848440800.

The previous prime is 2121102001. The next prime is 2121102041. The reversal of 2121102020 is 202011212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1222061764 + 899040256 = 34958^2 + 29984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2121101992 and 2121102010.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53027531 + ... + 53027570.

It is an arithmetic number, because the mean of its divisors is an integer number (371192857).

Almost surely, 2^2121102020 is an apocalyptic number.

2121102020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121102020 is an abundant number, since it is smaller than the sum of its proper divisors (2333212264).

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

2121102020 is a wasteful number, since it uses less digits than its factorization.

2121102020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106055110 (or 106055108 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2121102020 is about 46055.4233505675. The cubic root of 2121102020 is about 1284.8542118868.

Adding to 2121102020 its reverse (202011212), we get a palindrome (2323113232).

The spelling of 2121102020 in words is "two billion, one hundred twenty-one million, one hundred two thousand, twenty".