2120212121020 has 96 divisors (see below), whose sum is σ = 5389246300032. Its totient is φ = 683989843968.

The previous prime is 2120212121009. The next prime is 2120212121023. The reversal of 2120212121020 is 201212120212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2120212120985 and 2120212121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2120212121023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9112372 + ... + 9342148.

It is an arithmetic number, because the mean of its divisors is an integer number (56137982292).

Almost surely, 2^{2120212121020} is an apocalyptic number.

2120212121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120212121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2694623150016).

2120212121020 is an abundant number, since it is smaller than the sum of its proper divisors (3269034179012).

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

2120212121020 is a wasteful number, since it uses less digits than its factorization.

2120212121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233687 (or 233685 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2120212121020 its reverse (201212120212), we get a palindrome (2321424241232).

The spelling of 2120212121020 in words is "two trillion, one hundred twenty billion, two hundred twelve million, one hundred twenty-one thousand, twenty".